Regain Software Wins Rising Star and Great User Experience Awards in FinancesOnline.com Review

Regain OST to PST Converter Distinguished by Business Software Directory for Outstanding Ease of Use in Its Communications Software Category

Regain Software is committed to go beyond the line of duty to provide its customers with the best possible products to meet all their needs and requirements. To make this possible, one of the key elements we focus on is intuitive software design and ease of use. In light of this, we are proud to announce that Regain OST to PST Converter received a glowing recommendation from FinancesOnline for its outstanding overall user experience.

FinancesOnline, a premiere platform for all kinds of B2B and SaaS systems, has certified Regain OST to PST Converter with the Premium Usability award for 2019. Garnering a 100% score on their Customer Satisfaction Rating, their business software experts found our conversion software “highly proficient” for converting OST files to PST without data loss. All features are included in our cost-effective Regain OST to PST Converter pricing license options, which means businesses like yours can focus on getting the job done.

One of the main reasons why FinancesOnline found Regain OST to PST Converter intuitive is its easy bulk file conversion. File conversion is fuss-free because users no longer need to tinker with unnecessary folders during the conversion process, which can benefit them greatly with more effective email management. It’s as simple as directly converting your files into PST in one go.

The FinancesOnline experts were also impressed with our software’s effectiveness in converting “even the most critically corrupted” OST files while still maintaining its integrity and structure.

We are also pleased to be distinguished as a Rising Star by FinancesOnline for satisfying the needs of customers and exceeding their expectations.

We would like to extend our appreciation to FinancesOnline and all our customers for believing in Regain. Your trust continues to motivate our team to provide you with better technologies.

How to Repair Corrupt or Damaged Outlook PST File?

When it comes to work with MS Outlook, you may find it hard to perform daily operations, such as downloading attachments, receiving or sending emails etc. and it can also cause some serious problems sometimes like unusual Outlook crashes etc. These problems usually come with some error messages that you can use to figure out the kind of error faced by MS Outlook.

Corruption of PST file is the most common reason behind such kinds of problems. After the corruption of PST file, Outlook may behave unusually and shows up different errors. Here are some of the common error messages which mean Outlook PST file is corrupted or damaged and you need to repair them.

Errors are detected in outlook.pst file
Outlook database file named outlook.pst is not personal folder
exe (Inbox Repair Tool) doesn’t detect outlook.pst file
When you try to send or receive messages, it shows error 0x80040119
It is not easy to access outlook.pst file
Running Outlook and getting Error: ISTORX32.DLL

The above error messages show that Outlook PST file is damaged severely and you need to repair it as early as possible so you can access emails and other items.

Repair Outlook PST files using tools

Microsoft offers some of the cool utilities, such as OST crop tool, Inbox Repair Tool etc. to maintain Outlook PST file integrity but those tools are not used widely in conditions detailed above. In that case, you should seek help from a third party tool Regain Outlook PST Repair.

It is among the best used applications to repair corrupt or damaged Outlook PST file. This tool has been designed with cutting-edge algorithms which ensure great success rate in case of severe file corruptions. The innovative GUI enables users to perform repair of PST files without any stress.

Repair PST files with the following steps

First of all, download Regain Outlook PST Repair tool. After downloading and installing Outlook PST Repair tool, here are the detailed steps below –

- Select PST file you want to repair – Once you start the software, click “Select” to load PST file. Browse the PST file location but if you don’t know about the location, choose the entire drive you can search. You can list the entire PST file available in the drive.

- Getting started – Once you select the PST file, click Start to continue. It will start repairing the software and corrupt PST file. It shows up all of the email items in tree view which is just like MS Outlook. You can preview the content of any email item.

Save recovered item – Select items you need to recover from the tree view and click on “Save Recovered Items” button. You can choose location where you would like to save file.

User can download this application from here. Free version allow user to save 30 emails per mailbox at free of cost. No technical skill required to access this tool. Download Now :

A Complete Guide to Export MBOX File to Mozilla Thunderbird

Do you want to export MBOX in Thunderbird? In this post, you will get all the details of importing files to Thunderbird from various sources. Here are some of these sources:

If you have exported various file formats into MBOX which should be imported to Thunderbird application.
You have old MBOX files saved in hard drive or any other external drive and you would like to add MBOX to Thunderbird profile.
You need to use Gmail in Thunderbird.
You might also want to import MBOX file into Thunderbird from different application but same format.

Note – If you have just installed Thunderbird on your system, you need add-on to import or export file on your local machine.

Before we go ahead to the discussion and add MBOX to Thunderbox, let get to the brief file format of Thunderbird and MBOX is usually located on the local system.

What is Mozilla Thunderbird?

Mozilla Thunderbird is an open source, cross platforms and is absolutely free email platform. It has a range of options for PC so you can integrate several mailboxes with POP or SMTP protocols. Thunderbird is responsive, lightweight information which works well. It stores all your contacts, emails and other files in mailbox, which is widely known as MBOX. It might be important to import MBOX file in Thunderbird as it is among the most popular and widely used email platforms.

Location of Thunderbird MBOX files

On Windows Vista, 7, 8.1 and 10

Type in %APPDATA% in Search Box on Windows Start menu.
Click “Roaming” item which appears on menu.
Now go to Thunderbird > Profiles. In this folder, each folder is a profile on the PC.

You can also go to your profile folder directly at this path – C:\Users\<Windows user name>\AppData\Roaming\Thunderbird\Profiles\<Profile name>\

Along with Mozilla Thunderbird, some of the most popular email clients supporting MBOX formats are Apple Mail, Netscape etc. MBOX format is widely used by pro users for business. Here is the complete manual method to import MBOX into Thunderbird client –

Import MBOX Files into Thunderbird (in Mac/Windows)

Here are the ways to add MBOX to Thunderbird. You may need to follow these methods because of different needs.

Import MBOX in Thunderbird (Windows)

First of all, users have to install ‘ImportExportTools’ add on to import MBOX to Mozilla Thunderbird. It is important to ensure that backup of MBOX file is created to avoid any chance of data loss if import process gets interrupted or fails.

Go to Tools > ImportExportTools > Import MBOX file on Thunderbird. Import one or more MBOX files directly in the dialogue box appeared. You can also change the option selected according to your needs and click OK.
Choose the MBOX file and click “Open”. The MBOX file is imported to Thunderbird.

Import Apple Mail MBOX file for Mac in Thunderbird

If you would like to switch to Thunderbird for Mac OS with manual process, go through this step-by-step process below –

Open Thunderbird on local system on Mac to start the process.
Go to Tools > Import option.
Now, it’s time to choose the Mail option from several options displayed in the existing wizard and click Next.
Now it will show up a screen. Choose the option Apple Mail and click “Next” to proceed.
You can see Apple Mail folder in LHS of Mozilla Thunderbird after the import process. It will have all your mail data.

Import Gmail MBOX to Thunderbird

Here are the detailed steps covered in the import process of Gmail MBOX data to Thunderbird client. In case of using Thunderbird in Windows operating system –

You have to configure Gmail account in Thunderbird client after the Launch Thunderbird on the System.
Now restart Thunderbird client and right click on the account and select settings from the list.
Go to local directory and copy the path of the location by clicking on Server settings.
Paste the copied path on Windows Explorer address bar and click Enter.
It will show up some files under the given location.
Now move MBOX file to the folder that has been opened.
Now restart the Thunderbird email client again and check left side to see content of Gmail under Local Folders in Thunderbird.

In Thunderbird for Mac, you can easily import MBOX file of Gmail into Mac Thunderbird by choosing File and proceed to import Mailboxes. Then, select the MBOX file and access the contents without any problem in Thunderbird account.

Verdict

I have used the above methods almost to import MBOX into Thunderbird. Well, I need to focus some lights on the cons of adding MBOX files or importing them to your Thunderbird manually.

It doesn’t allow importing the files in batches.
Thunderbird has no tool inbuilt to import MBOX file as detailed above.
There is always a risk of data loss.
Manual method is vulnerable to file corruption most of the times.

So, I personally recommend you to import files carefully. You can use Regain MBOX to PST Converter to convert mbox file in just few clicks. No Technical skill is require to access this application.

How to Convert Windows Live Mail EML files into Outlook PST for free?

Microsoft offers huge range of email applications like Microsoft Outlook, Outlook Express, and Windows Live mail which are used across the world according to users’ convenience. These email applications use various file formats for data storage. Windows Live Mail supports EML files and MS Outlook stores data in PST file.

The data is stored in body and header part of EML files. Windows Live Mail saves data with MIME RC 822 standard. In header format, EML files store ASCII characters and body part has hyperlinks, text, and attachments.

For migrating from Windows Live mail to Outlook, it is important to convert EML into PST file format. Hardware issues, file errors, synchronization and other errors are some of the problems in Windows Live mail. Here are the steps to convert EML into PST files manually.

Steps for EML to Outlook PST file conversion

Open Windows Live Mail and MS Outlook
Click on File under Windows Live Mail
Select Microsoft Exchange under Export > Email Messages
Windows Live Mail Export box will be opened by clicking on Next
You need to choose from Microsoft Windows Live Mail and Microsoft Exchange where you want to export email and click Next.
It will show up a dialog box “This will export messages from Windows Live Mail to Outlook”, click Ok
Now choose mail folders you want to export. You can select from either “Selected folders” or “All Folders” option.
Click “Finish”

After that, a message will show up that messages are exported successfully.

How to Transfer Outlook PST to Office 365 with Network Upload Manually?

Microsoft Office 365 is a best suite which offers cloud based services for the users. By considering the features from Office 365, a lot of people migrate from MS Outlook to Office 365 platform. You can use the professional Regain Outlook PST to Office 365 migration tool but you can also use the free method to do this. When it comes to migrate from PST to Office 365, you need to upload PST files to Office 365 with the option of “Network Upload”.

PST files to Office 365 export is a very complex task and it has some prerequisites before you start the process of migration. It is important for the users to understand the tools and techniques used in this process. Here are the tools needed for migration of PST files to Office 365 –

SAS URL
Azure AzCopy
Command Prompt (CMD)

How to Perform PST to Office 365 Migration

When it seems too complex to transfer single PST file to Office 365, you can migrate PST files into Office 365 in bulk with “Network Upload” option. Here are the detailed steps to import PST into Office 365.

Step 1: Azure AzCopy Installation and Copy SAS URL

SAS URL is a URL network which can be used to store Azure in a location in MS Cloud and Shared Access Signature Key SAS Key for organization. SAS key has set permissions to move email from outlook storage of Azure.

Go to protection.office.com link
Log in to Office 365 admin account
Select the option Data Governance and click import button
It will open the Import page and click “Import Service”
Click on New Job and Upload PST files
It will open the page to upload files and select the show network to upload SAS URL.
Copy URL and save in a file location
Go to “Download” and install Azure AzCopy.
Click on “Run” button when a pop-up window appears

Step 2: Import Bulk PST to Office 365

Type CMD in search bar after clicking Start button
Right click on Command Prompt and click “Run as administrator”
Migrate PST files into Office 365 with AzCopy.exe tool

Step 3: Ensure that PST files are uploaded

Install MS Azure Storage Explorer
Open explorer and check out the list of PST files to Office 365
Now you can see the files stored on Azure where they can be mapped to the mailboxes.

Step 4: Create PST to MAP file

Now you need to convert files to Comma Separated Values (.CSV format). Such kinds of files are imported to user mailboxes.

Step 5: Export Files to Microsoft Office 365

Use your administrator account to enter Office 365
Select import under Data Governance
Click on Import services from import window
Select new job and (+) and click upload email.
Select “I am done uploading my files” on Upload Files over the network and enable “I have access to Map file” and click Next.
Select PST import and click next.
Add PST mapping by clicking Add button.
Click on Validate CSV after selecting CSV file stored.
Enable the checkbox “Read terms and conditions”
Click Finish to submit job to import PST to Office 365.

It will finish the process for Outlook PST to Office 365 file transfer. As the method of PST to Office 365 is not so easy, it needs a lot of applications. So, it has certain risk. It needs technical knowhow. If you want to avoid this stress, backup Outlook PST files before doing migration.

You may also try this Regain PST to Office 365 application, Go through Free version to see Results. You can download this tool from here:

Tips and Tricks to Fix MS Outlook Error 0x800ccc0e

MS Outlook is, without a doubt, is the most widely used email client used by endless users across the world. It offers high-end performance and great features. On the other side, it also has few drawbacks. It is very common these days that you encounter error messages in MS Outlook.

If it happens to you, there are chances that you may have come across the common error message “0x800ccc0e” which means a conflict with Outlook client. This error code is very common in Microsoft Outlook client in your Windows and you don’t know how to fix this error. As a result, you will notice sluggish performance of MS Outlook when you get this error message. Hence, you cannot receive/send emails and also delete previous email messages.

Not only MS Outlook, but also Windows Mail and Microsoft Outlook Express also get the error message 0x800ccc0e. You sometimes get this error message when you have to send email during account setup. Here are the tips and tricks to fix Outlook error code 0x800ccc0e.

Here are some of the common reasons why you are getting this error message

There are different reasons behind the error code 0x800ccc0e. here are some of the common reasons –

Wrong ISP connection
Wrong email settings
Conflict with Antivirus
System malfunctioning
Corrupt email files
Faulty add-ins in Outlook

Tips to Fix Outlook 0x800ccc0e Error Code

When using Microsoft Outlook client, it is very common for you to come across this error message. You might find it almost impossible to crack this error code. Outlook 0x800ccc0e error is one of the most inevitable error codes. You should follow these tricks to fix this Outlook error message –

Disable Antivirus Software

Sometimes antivirus program causes serious conflicts. It can keep action of receiving/sending emails and it can cause other errors. Hence it is recommended to disable the antivirus program while receiving/sending emails. Disable the antivirus temporary if you see the error message 0x800ccc0e and see whether the error is fixed.

Disable Outlook add-ins

If you have installed any add-in on MS Outlook, it may be causing trouble in the form of this error message. You should disable the add-in before sending or receiving this email message. If error is fixed, it means the faulty add-in you are using should be removed.

Look for Malware/Virus

As you know, virus/malware is very harmful for your system. It is one of the obvious reasons for any problem. So, you should start by checking for malware/virus always on your system. Be sure your system is fine and free from any malware or virus. Also use Antivirus system to avoid malware or virus attacks. Also use the in-built Outlook repair tool to repair corrupt registry files.

Look at Email Settings

Email providers generally perform routine maintenance of their servers and add more new settings. It can cause unexpected changes in your email. It may take place when email settings stop working with new changes made by the email provider. So, you need to find out whether email settings are right or not. Correct them if they are not to fix Outlook error.

Remove Duplicate Email Accounts

Duplicate email accounts can also cause conflicts and Outlook error 0x800ccc0e code. So, be sure to remove duplicate accounts, if any. Here are the steps to do so –

Click Tools tab on the main menu
Click Accounts and go to the Mail tab
Select duplicate account and click Remove button

Restart MS Outlook and find out whether the error is fixed or not.

Repair MS Outlook Email Client

The Outlook installation might be corrupt. This is why you are getting this error code. Fortunately, you can have a default option for Outlook repair. Repair the Outlook email client and see if problem is fixed.

Repair Outlook Data

Well, it is the final solution for you. Outlook data file may be corrupt. So, you need to repair Outlook file, either using third-party tool or manually. It has scanpst.exe, a default Inbox repair tool which can repair Outlook data. In case data is severely corrupt, you can use Regain Outlook PST Recovery tool, a professional tool to repair Outlook PST.

Bottom Line

As discussed before, Outlook error 0x800ccc0e is one of the most common issues in MS Outlook. We have discussed all the causes of error message and common solutions to fix Error 0x800ccc0e. If it is not fixed yet, you may try Regain Outlook PST Recovery Tool. You can download the free trial version from here :

Step-by-Step Guide to Convert Lotus Notes (.NSF) to Outlook PST File

MS Outlook and IBM Lotus Notes are some of the most widely used and most anticipated email clients. These email clients have ruled the market for a while now. IBM Lotus Notes have been used widely since 1989, and along with being email client, it offers a lot of features like calendaring, scheduling, and programming.

On the other side, MS Outlook offers all the feature bundles to its users in an easy to use and simple UI. But IBM Lotus Notes is not that easy to use, it is still a great encryption on the edge. Various users and organizations naturally started migrating and moving from Lotus Notes to Outlook.

Why to Convert NSF to PST?

IBM Lotus Notes has been widely used as an email client for several organizations for a long time. It offers unmatched security features with encryption. Since it has stopped support for earlier versions, it is not easy to maintain this email client. To reduce cost because of high maintenance requirements and to improve productivity, a lot of organizations are moving to another email client.

Problems with IBM Lotus Notes

As support for IBM Lotus Notes has been ended in earlier versions, a lot of organizations and users are moving to other email clients to reduce maintenance costs.
Despite being famous for great security, IBM Lotus Notes has lost its accessibility to a great extent. It doesn’t allow any plug-in support or synchronization with third-party email clients.
IBM Lotus Notes has a lot of learning curve. Only users with great technical knowledge can use it. So, beginners don’t have to use this client. So, IBM Lotus Notes is much useless.
When it comes to support, IBM Lotus Notes doesn’t support any tablet or smartphone. So, you cannot access this client remotely.
In addition, it limits its users to access only one account at a time. You have to log out of existing account to access another account with details.

Why Switch to MS Outlook?

Main reason people switch to MS Outlook is low cost of maintenance. Outlook comes under MS Office suite. So, there is no need to buy it individually.
It provides unmatched accessibility. You can open it from Mac, PC and even mobile devices.
It supports a lot of plug-ins. You can use multiple accounts and connect with several apps at the same time, such as OneDrive, Skype, Twitter, and LinkedIn.
As compared to IBM Lotus Notes, MS Outlook is very user-friendly as it comes with automatic email organization for filtering and sorting, and Search Feature.
You can use and access various accounts on Outlook at the same time without entering credentials every time.
MS Outlook has been designed by considering various needs of beginners and vast expert demographics.

MS Outlook is among the widely used email clients. For IBM Lotus Notes to Outlook migration, you need to perform NSF to PST file conversion. We will discuss two different methods in this article to migrate Lotus Notes to MS Outlook.

Method 1 – NSF to PST Conversion Manually

As you know, you cannot access NSF file using MS Outlook. So, we will first discuss how to do it manually. Even though it doesn’t assure complete migration of database in original format, you can still go with this option if you want to access only a handful of data.

This manual method needs you to extract data from NSF and save the data in PST format that you can also access through MS Outlook and import the same to Outlook client. In this method, this file in which data is saved would be CSV. There are two steps in manual process –

Exporting data from Lotus Notes and saving in another file.
Importing data from separate file in MS Outlook.

Exporting data from Lotus Notes and saving in another file

1. Open IBM Lotus Notes Client

nsf to pst converter software

2. Select NSF file where you have to export data

NSF to PST Converter

3. Once you select and open file on Lotus Notes, click File on the menu bar and click Export on the drop down menu.

NSF to PST Migration tool

4. Enter file name, location of file, and file type as CSV on Export Wizard.

Export NSF to Outlook PST file

5. It will show up CSV Export dialog box and you can select important options.

NSF to PST file conversion tool

Importing data from separate file in MS Outlook

1. Open MS Outlook

Lotus NOtes to Outlook PST Migration

2. Click on File and click Open and Import from drop down menu

Lotus Notes to Outlook PST Migration - Free Guide

3. Once you click Import, it will show up Import and Export Wizard and it will show up different options. Select “Import from another file or program” and “Next”.

Manual NSF to PST File Converter tool

4. Choose file type as “Comma Separated Values” and click Next.

Free helping guide for nsf to pst converter

5. Click Browse and find CSV file created with Export Wizard in Lotus Notes. Select from the options provided on whether you want to create duplicate entries or not and click Next.

nsf to pst converter manually

6. Now choose Outlook folder where you want to import data and click Finish.

step by step guide to convert nsf to pst file

7. Data saved in CSV file will be imported in MS Outlook.

Sucessfully save nsf to pst converter manually

Problems in Manual Conversation

Manual conversation allows you to import email header and not the whole body content
It is a very tedious process and is complex enough and is surely not good for basic users.
Since manual process takes a lot of time, it is not good to migrate the whole databases in those situations.
Migrating with manual process is very difficult and it should be done with care as incorrect technique might cause corruption of files.
CSV format is used as mediator by manual conversation. Due to this reason, files are imported in raw format. It might not transfer data in original formatting or to maintain folders and files hierarchy.
Manual technique just allows NSF file for conversion at a time which can make whole process boring and stressful.
You cannot perform selective data transfer in this process. You need to transfer whole file.

Method 2 – By Using Regain NSF to PST Converter

You need a Regain NSF to PST Converter to migrate from IBM Lotus Notes to MS Outlook. But data is stored in IBM Notes in NSF format and MS Outlook uses PST format in doing the same. So, you can use Regain NSF to PST converter to convert NSF file to Outlook PST format so you can convert database of whole NSF into PST format smoothly and easily.

The tool uses effective algorithm for NSF to PST file conversion even though NSF file is encrypted. Regain NSF to PST converter doesn’t need any specific technical skill to use and it is best for all businesses. You can download this software from here:

Here’s the step-by step process for NSF to PST file conversion –

1. Open Regain NSF to PST converter.

Regain NSF to PST Converter - Home Screen

2. Choose NSF file to perform conversion and start the process of scanning.

Select Lotus Notes NSF file for Conversion

3. Scanning Process start to retrieve Lotus Notes Mailboxes

Scanning process for Lotus Notes NSF file

4. After Complete the Scanning, Show the preview of Lotus Notes Mailboxes before Saving to another format.

Show preview of all convertible Lotus notes mailboxes

Saved Desire file format to Save NSF file.

Support multiple format to save nsf file to pst, mbox, eml, emlx and msg file format

Conversion process complete.

Sucessfully save nsf file to pst file

Conclusion

When it comes to migrate the whole databases, it is not wise to use manual method. It makes the whole process very difficult and complex. Regain NSF to PST converter is a complete tool which caters to all specifications of NSF to PST conversion. It keeps the NSF intact for conversion of NSF to PST file format. It is the best tool to perform bulk file conversion and convert data like calendar, emails, journals, contacts, etc. with precision.

How to Fix OST File Synchronization Error?

OST File is created in Microsoft Outlook when Microsoft Exchange account is created. Also known as Offline Storage Table, this file enables users to work when Outlook is not connected to the server. Once the connection is available, you can synchronize all the work in MS Outlook offline with Exchange Server. Indeed, it makes Exchange mailbox in the form of OST file.

Why OST File Synchronization Error Occurs?

More often than not, you may encounter several synchronization errors when connecting OST to Exchange mailbox. There are different reasons why synchronization is stopped with Exchange in Outlook 2003, 2007, 2010, 2013, 2016 and 2019.

Network connection – The main cause of synchronization issue
MS Exchange Server also goes down more often due to which Outlook cannot synchronize
Problems in local machine are another common issue when Outlook is malfunctioning
Sudden system shutdown, large OST file size, and virus attack are some of the common reasons

How to Fix OST Synchronization Issue?

There are different steps you can take to resolve the OST synchronization problem, such as verifying user profile, cached exchange mode etc. Here are some of the important steps to get rid of this problem –

Step 1 – Verify Synchronization of OST files

Consider the following steps to check synchronization of Offline Storage files in proper way –

Right Click on the folder you want to check and click “Properties”
Switch to “Synchronization” tab
Select “Statistics” of this folder and check these attributes –
- Server folder contains – Items
- Last synchronized on – Date
- Offline folder contains – items

If you don’t have any OST File Sync problem, attribute value of the folder of Server as well as offline folder contents are the same. If you couldn’t find these value same, there must be a conflict in syncing both databases. In that case, you have to follow these processes to verify profile settings.

In Outlook 2007

Click on “Tools” then “Account Settings”
Click “Data File” and set “Mailbox account name as default”
In Email tab, go to “Mailbox – account name” and Settings.
Check the option “Use cached Exchange Mode” and click OK.

Step 2 – OST File Synchronization

You have to do two important things to sync offline folders – Automatic and Manual, to fix OST file synchronization issues.

For Manual Synchronization

Go to “Folder List” pane, choose “Folder should be synchronized”
Go to “Tools” menu, click “Send/Receive”, then Microsoft Exchange Server, if you have specific folder
In Tools menu, go to “Send/Receive All” for all folders

For Automatic Synchronization

With this method, you can sync OST file with Exchange Server all the time when you go online.

Choose “Tools” and “Options”
In Mail Setup, select “Send Immediately when connected”
In Send/Receive, select “Send/Receive groups” and check “Perform automatic send/receive when exiting”.

Step 3 – Create New OST File and Synchronize

If the above methods cannot fix the OST file synchronization issue and you are not getting it synced, there are chances that OST file is corrupt or damaged. In that case, you have to recreate and resynchronize the OST file.

How to Rebuild New OST?

Type *.ost in search box to look for OST file
Rename the old file with different extension. For example, replace .OST with .OLD extension.
After renaming the file, a new file will be created
In Outlook, go to “Tools” and “Send/Receive”

Summary

If the OST file is oversized and is not accessible, an OST crop tool can split the file into smaller parts. If you still cannot resolve the OST synchronization issue, you may try scanost.exe or scanpst.exe tools from Microsoft. These are the default repair tools to fix OST/PST file issues. You may try these tools to fix them. If these tools can’t work and you cannot access the OST file data, then use Regain OST to PST Converter to import and access the OST file through Outlook.

Regain OST to PST Converter tool is very reliable and professional as it can easily fix OST files that are severely corrupt or damaged and cannot be fixed by default repair tools. If the above methods are not longer helpful, use this tool to resolve data file problems and recover them with few easy steps.