How to Import OST files to Gmail – Complete Guide

Updated On - March 14, 2023 by Deepika Singh |

Reading Time: 5 minutes

In this blog, we explain what is the need of migrating mailbox from OST to Gmail and know, how to import OST files to Gmail account without loosing any data. Lets go ahead.

Microsoft Outlook is one of the known, widely-used and most-trusted email client used worldwide both by home users as well as business users for sending or receiving emails. PST and OST are the two file formats used by MS Outlook. OST is an offline Outlook data file that allows working offline and helps synchronizing account types such as IMAP, Office 365, and Exchange Server information to your system. Once connected to the Server, all changes made to OST file gets synchronized to the Server.

Gmail has become the most commonly-used means of communication. Gmail is browser-based email client, so user has a freedom to access the account anywhere around the globe irrespective of the system being used.

What is the Need to migrate Offline Outlook OST File to Gmail Account

  • Offline Outlook OST files are susceptible to corruption and thus large numbers of users search for solutions to migrate offline Outlook OST files to Google account.
  • Also, it is hard to open OST files on any other system than the one on which it was not configured.
  • Accessing offline Outlook OST file requires appropriate connectivity with Microsoft Exchange Server.

If you are looking for a way for how to import your offline Outlook OST files to Gmail account, then you have arrived at the right page. This article discusses the manual method to perform the migration from Outlook OST to Gmail. Migrating your offline Outlook OST files to Gmail account manually could be a tedious task for you and requires competent technical skills to perform the accurate conversion.

Related Blog: OST File Corruption Reasons and Their Solutions

Manual Method to import offline Outlook data File (OST file) to Gmail account

Manual method for importing Offline Outlook Data File or OST File to Gmail account consists of mainly three steps:

  1. Locate OST files
  2. Export OST File as PST file
  3. Import PST file to Gmail account using G Suite Migration for Microsoft Outlook (GSMMO) application.

Let’s discuss the above three steps in detail now.

Step1: Locate OST Files

  1. Navigate to File > Account Settings > Account Settings.
  2. Click on Data Files tab, select OST file to be migrated to Gmail account. Click Open File Location button.

Step2: Export OST File as PST File

  1. Open Microsoft Outlook application. Navigate to File > Open & Export > Import/Export. Import and Export Wizard opens.
  2. Select Export to a file option, click Next. Export to a File wizard opens.
  3. Select Outlook Data File (.pst) option for Create a file of type. Click Next.
  4. Click on the required email account, select the item(s) that you want to export as a PST file. Select “Include subfolders” checkbox. Click Next.
  5. Click Browse to provide the location to save the PST file.
  6. Select option “Replace duplicates with items exported”. Click Finish.

Related Post: Fix “The file username.ost is in use and cannot be accessed” in Outlook 2016

Step3: Import MS Outlook PST File to Gmail Account using G Suite Migration for Microsoft Outlook (GSMMO) application

  1. Open any Web browser (Chrome, Internet Explorer, Firefox, Safari, etc.).
  2. Search G Suite Migration for Microsoft Outlook application and download it and install it.
  3. Search for the installed application and then launch it.
  4. Provide the Email address. Click Continue.
  5. Sign-in page appears, enter the password. Click Next.
  6. A message appears that G Suite Migration for Microsoft Outlook (GSMMO) wants to access your Google account. Click Allow.
  7. A confirmation message appears “Authorization has been granted successfully. Please switch to your application”.
  8. G Suite Migration for Microsoft Outlook application opens. For “Select a Microsoft Outlook\x00AE user profile or PST files to migrate” option, select “From PST file(s).”
  9. Select “Migrate only new data” option. Click Next.
  10. The screen shows the location where all Outlook PST files are saved. If you have saved your converted PST file to a different location, then paste that location’s file path in the Address bar.
  11. The PST file gets imported. Click Next to proceed.
  12. Under Migration Settings, select the data you wish to migrate such as Calendar, Contacts, Email messages, etc. Click Migrate.
  13. The migration process gets initiated. The time taken for migration depends on the size of the PST file. A pop-up message appears on successful migration. Click OK.
  14. Now login to your Gmail account and look for the newly-imported PST file in the left pane.

Automated tool to import OST files to Gmail account

Import offline Outlook OST file to Gmail account directly using a professional third-party tool. This feature-packed third-party tool allows migrating Outlook OST emails into Gmail account accurately along with all folders, sub-folders and attachments without losing any data and maintain the integrity, hierarchy and folder structure.
Free Download100% Secure Buy NowPrice: $39

Remarkable Features:
  • Import offline Outlook OST files to Gmail account. Also, allows importing to other email clients including Yahoo Mail,, Go Daddy, Amazon Workmail.
  • Exports offline Outlook OST file data to Office 365 or Exchange Server platform.
  • Converts offline Outlook OST files to PST, EML, EMLX, MSG, MBOX, HTML, ICS, PDF, TGZ, and vCard (.vcf) file formats.
  • Converts single as well as multiple offline Outlook OST files to Gmail account in a single go.
  • Even converts large-sized OST files to Gmail account in a fraction of time.
  • Converts password-protected OST file to Gmail.
  • Accurately converts damaged or corrupted offline Outlook OST file to Gmail account.
  • Recovers permanently deleted emails.
  • Does not saves your credentials while performing the migration.
  • Maintains data formatting, folder structure and hierarchy intact upon migration.
  • Migrates all folders including emails, email attachments, calendar events, contacts, diary entries, tasks, notes, drafts, etc. from Outlook OST file to Gmail account.
  • Displays preview of convertible emails.
  • Allows conversion of selective OST folders to Gmail account.
  • Available as a free to download trial version. The free demo version will convert only 30 emails per folder. To convert unlimited emails per folder, purchase the full licensed version.
  • Does not require any technical skills to perform the OST to Gmail conversion.
  • Offers an easy-to-use, intuitive, interactive, self-descriptive graphical user interface.
  • Supports Microsoft Outlook 2019, 2016, 2013 (32-bit and 64-bit), 2010, 2007, 2003, 2002, 2000, 98, and 97 versions.
  • Compatible with Windows 11, 10, 8.1, 8, 7, Vista and XP operating systems.
  • Lifetime free technical support on purchase of licensed version.
  • Safe to download and install, free from viruses and malwares.

Steps to perform while using Professional OST Converter tool

  1. Download, install and then launch the Regain OST Converter tool.
  2. Click Add file or Add Folder to select the OST files. Click Save.
  3. Click Start Scan to initiate the scanning process. Then click Preview from drop-down option.
  4. Click on Cloud Migration and then Select Gmail, A Pop up Window will appear and ask for Login Details of Gmail Account.
  5. After Entering the Correct Details, you can easily import OST file data to Gmail account.


This blog discusses about using G Suite Migration for Microsoft Outlook (GSMMO) desktop application to import offline Outlook OST files to Gmail account. Using GSMMO application is a time-taking and tedious task, requires technical skills to perform the migration process. To save time and effort, it is highly recommended to use a third-party tool to perform the conversion.

Author: Deepika Singh

My self Deepika Singh working as a Technical Writer in Regain Software. Having 4+ years experience in Writing Technical blogs, Manual Guides and Articles. I am working on all Regain Software products.

One thought on “How to Import OST files to Gmail – Complete Guide”

  1. Avatar Roy Alexander says:

    Thanks for the helpful information! With your instruction, it’s now much easier to know how to import OST files to Gmail.

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