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Microsoft Outlook stands as the most relied upon and extensively utilized email client. Within Outlook, there are two prominent file formats in use, PST and OST, associated with POP and IMAP accounts, respectively. In this article, we will explore methods for importing OST files into Gmail.

Instant Solution

Try automated tool Kernel Import OST to Gmail to import multiple OST files to Gmail account. It supports OST files from all Exchange Server versions.

How does OST Work?

Offline Outlook Data File, or OST, is employed with account types like IMAP, Office 365, and Exchange to maintain a synchronized copy of your mailbox data on your local system. While working offline, you can access Outlook but won’t be able to send emails. Once server connectivity is reestablished, any modifications made to your OST file during the network interruption will synchronize with the server. In essence, your OST file data will be brought back into alignment with the server data.

Now we will focus our effort on the problem in hand- importing OST files to Gmail.

Using Manual Method

Using Automated Method

Import OST to Gmail Manually

Importing OST files into Gmail directly is not a feasible option. Therefore, it’s advisable to convert them to PST format beforehand. It’s worth noting that OST files often contain email data from third-party accounts (previously configured in your MS Outlook desktop client using IMAP settings), such as Gmail, AOL, or Yahoo.

To import OST files, one needs to find the location first. One can easily do that by following the steps mentioned below:

Step #1 Locate your OST Files

  1. Click File > Account Settings > Account Settings.
  2. Account Settings

  3. Now, click on the Data Files tab, select any OST file, and click on Open File Location button.
  4. Select and Open File Location

    Note: Generally, OST files can be found here irrespective of the Outlook version-


Note: It is to note that the AppData folder might be hidden; hence, the user has to unhide it first. To do so, in C:\Users\user, click on View tab > Options. Go to the View tab, expand Hidden files and folders, and select Show hidden files, folders, and drives.

Step #2 Export your OST File as PST

  1. In MS Outlook, click on the File tab > Open & Export > Import/Export. This will open up the Import and Export Wizard.
  2. Here, select the Export to a file option and hit Next.
  3. Import and Export Wizard

  4. This will open up Export to a File dialog window, select Outlook Data File (.pst) option and hit Next.
  5. select v

  6. Now click on the required email account and select the item that you want to export as a PST file and hit Next.
  7. select OST file to export in PST

  8. Now click on the Browse button to save the PST file to the desired location and hit Finish.
  9. Finish the process to save OSt in PST file

Congratulations! You have successfully converted an OST file to PST. Now we will explore ways to import this file to Gmail.

Step #3 Import PST to Gmail via. G Suite Migration for Microsoft Outlook (GSMMO) tool

G Suite Migration for Microsoft Outlook (GSMMO) desktop application lets the user import the PST file to the user’s Gmail account. The process is described below:

  1. In any browser, search for G Suite Migration for Microsoft Outlook and download the application.
  2. Launch the application by searching for it.
  3. G Suite Migration for Microsoft Outlook

  4. You will be asked to provide the login information, click Continue to proceed.
  5. login G Suite Migration for Microsoft Outlook

  6. This will open up the sign-in page in your default browser.
  7. open up the sign-in page

  8. Next, you will be asked with a message that GSMMO wants to access your Google account. Scroll down and click on the Allow button.
  9. Allow to access Google account

  10. If everything goes well, then you should see a confirmation message as shown below:
  11. confirmation message

  12. This will open up a new dialog window. From the drop-down menu, select From the PST file(s) option and click Next.
  13. select the PST file

  14. You will be taken to the location where all outlook PST files are saved. In step 1, if you have saved your converted PST file to a different location, then paste that location’s filepath in the Address bar.
  15. The file is now imported, click Next to proceed.
  16. PST file imported

  17. Adjust the migration settings as required. Once done, click on Migrate.
  18. Adjust the migration settings

  19. This will initiate the migration process. Depending upon the size of your PST file, the process might take a while. Once done, you will be prompted with a message of successful migration.
  20. successful migration done

  21. Log-in to your Gmail account and look for the newly imported PST file in the left pane.
  22. New PST file created

Congratulations! You have successfully migrated your Outlook PST file to Gmail.

Direct Method to Import OST Files to Gmail

The most efficient way to directly import OST files into Gmail is by utilizing a third-party tool. Kernel Import OST to Gmail stands out as an excellent solution for such migrations. This comprehensive tool not only enables the recovery of permanently deleted Outlook mailbox items but also maintains the hierarchy during the migration process. Moreover, it offers the flexibility to save OST files in various formats including PST, MBOX, PDF, DBX, EML/MSG, and more. Notably, it can directly export OST data to live Exchange Servers and popular webmail clients like Gmail, Yahoo, AOL, and others. Additionally, it boasts the capability to repair inaccessible or corrupted OST files before conversion.

Prerequisite: To employ a third-party tool like the Kernel Import OST to Gmail tool to access your Gmail account, you must generate an app password instead of using your regular account password. To create an app password, please follow the steps outlined below:

  1. Click on your Google Account icon and select on Manage your Google Account button.
  2. Manage Google Account

  3. From the left navigation, pane choose Security. Make sure that the 2-step Verification is turned on (otherwise, this won’t work!). Next, choose App passwords.
  4. choose App passwords

  5. Now, from the drop-down menu, choose Other (Custom name).
  6. choose custom name

  7. In the text box, enter Kernel Import OST to Gmail and click on GENERATE.
  8. GENERATE Kernel for OST to PST

  9. Copy the generated password for later use. Click Done.
  10. Copy the generated password

This is your app password, which you will be using instead of your Gmail account password to migrate the OST file to Gmail using Kernel Import OST to Gmail tool.

Import OST file to Gmail using Kernel Import OST to Gmail
  1. After launching the tool, click on the Select File tab. This will open a new window. Click on the Browse button to add the OST file.
  2. add the OST file

  3. Read the Process Information carefully and click Finish to proceed.
  4. Read the Process Information

  5. Depending on the size of the data, the processing might take a while.
  6. processing start

  7. Select the files/folders that to want to migrate from the folder hierarchy and click on the Gmail icon.
  8. Select the files/folders to migrate

  9. Click Next to proceed.
  10. Click Next button

  11. Apply the mail filters to migrate specific data and hit Next.
  12. Apply the mail filters

  13. In the Login ID section, enter your Gmail account id, and in the Password text box, enter the earlier generated app password (see the Prerequisite section).
  14. enter the earlier generated app password

  15. The migration will take some time, depending upon the file size.
  16. migration in process

  17. If the migration is successful, then you will be prompted with the following message:
  18. migration is successful done

  19. Check your Gmail account to see if the folders were successfully imported to Gmail.


In this blog post, we’ve explored the G Suite Migration process for Microsoft Outlook desktop applications, which can be a time-consuming and arduous task when migrating OST files to Gmail. To streamline this process and save valuable time and effort, we’ve also introduced the Kernel Import OST to Gmail utility. This tool offers a range of valuable features that distinguish it from other options in the market. Therefore, we highly recommend users to consider using the Kernel Import OST to Gmail tool for a seamless and efficient migration experience.

Video – Ways to Import OST File to Gmail


Kernel Import OST to Gmail