How to Convert OST to Office 365

Office 365 is a very useful service provided by Microsoft Outlook for storing data such as emails, files or other data on the cloud platform. Hence, storing important data like emails in Office 365 is very resourceful as these emails can be useful when needed. However, you need to follow the correct methods to migrate OST email to Office 365. If you read this article carefully till the end, I can say with the claim that you will be able to convert OST to Office 365 very easily without any technical expertise.

You cannot move Outlook OST files data directly to the Office 365 environment. To convert OST to Office 365, you need to convert the OST file to PST first. After that you can upload the PST file to an Office 365 account to access the same data available in the OST file. In addition, you can also use any third-party tool to convert OST emails directly to Office 365.

Here are the steps to convert OST to Office 365 after converting to PST:

The 2 main steps that we have to follow for converting OST files data to Office 365 are:

    Step 1: Convert OST file to PST

    Step 2: Migrate PST file to Office 365

Step 1: Convert OST to PST

Using the Export feature of Outlook

  • Start Outlook application on your system.
  • Go to FileOpen & ExportImport / Export
  • Now click on the Export to a file option and then Next tab
  • Now select the Outlook Data File (.pst) option and click Next
  • Now select the folders you wish to export (make sure that Include subfolders check box is checked) and click Next
  • Select destination location for the exported file. Click on Finish to complete the process.

You can easily convert OST to PST using the Import/Export wizard, but remember that this method has some drawbacks. This method does not help you to convert OST data like- meeting schedule, folder properties, messages rules, etc. Fortunately, you can completely convert OST to PST without losing any data. But, for that you need to use a trusted OST to PST converter to convert all the Outlook data.

If you are unable to use the converted PST file after the conversion, then all your time and resources may go wasted. Therefore, it is important not to miss any details while converting OST files data to PST file format. Regain OST to PST Converter is powerful software that can effectively convert OST to PST. The tool is very beneficial for converting corrupt and inaccessible OST files. Now download and install the software.

Step 2: Export PST file to Office 365

Drive shipping to Microsoft

If you need to export a large number of emails to Office 365, uploading the emails can be time consuming. A convenient way to export email is by shipping the drive to Microsoft Outlook.

When you ship your data to Microsoft, you will need to copy the PST files to a hard drive and then ship them to a Microsoft physical location. Microsoft then copies the data and uploads it from a hard drive to Office 365.

Upload your PST files to Office 365 using Azure AzCopy

First, sign in to a Microsoft Office 365 account and follow the steps below:

  • In the Security & Compliance Center, go to Information Governance >> Import >> Import PST Files.
  • On the Import PST File page, click New Import Job, enter a new job name, and click Next
  • Now select the Upload data option and click Next
  • On the Import Data page, click Show network upload SAS URL
  • When the SAS URL is displayed, click Copy to Clipboard, paste it and save it in an Notepad.
  • Now click Download Azure AzCopy to download and install the AzCopy tool.
  • Open the tool and type here AzCopy.exe /Source: /Dest: /V /AzCopy.log /Y

Important Note: In the above step, the location of the file is the path where you saved the PST file to be uploaded. SAS-URL is the URL that was copied into the Notepad.

A safer way to convert OST to Office 365 platform

Download and install the Regain OST to Office 365 Migration tool on your computer. Please follow the steps below carefully.

  • On the main screen of the software, click on 'Add file' or use the browse button to add the OST file and then click 'Scan' tab.
  • After the scanning process, software will preview the selected OST files
  • Select the Office 365 option in the server type and provide the USER ID nad Password of Office 365 account and click on Connect
  • When the migration process is complete, click Finish


The steps mentioned in the article to convert OST to Office 365 should be followed carefully as minor mistake can result in certain files being lost. However, you don't need to worry as you can easily export Outlook data to Office 365 using Regain OST to Office 365 Migration tool. With this migration tool, you can securely convert OST to Office 365 account in a short time without data loss.