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To Import OST files to Gmail Account, there are multiple solutions available in the market. To perform this migration, let me share some free or manual solutions with you.
1) Get the Location of your OST file
2) Export your OST file to PST format using Import/Export Feature
The OST file is not compatible with the Gmail account. SO, it's better to convert data in PST format.
The next step is to use the (GSMMO) Tool provided by Google.
The manual method is time-consuming and even takes a couple of hours to complete the process. Also, it requires a proper portion of time to accomplish the task. You can check out the mentioned blog post page to simplify the process.
Know the Effortless Procedure to Import OST to Gmail: https://corbettsoftware.com/blog/import-ost-file-to-gmail/
The Linked post has a one-stop solution that allows importing OST in Gmail in batch with any error and difficulty.