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Here is a complete manual methods explained to Convert OST to PST. However, you can take help from any third party tools if manual method doesn't work for you.
Read a complete blog on how to convert OST file to PST Online
Converting OST files to PST online with manual methods can be challenging as it typically requires the use of specialized software. However, you can try the following approach:
Export OST to PST using Outlook: If you have access to the Exchange Server and Outlook account, you can configure the OST file with the account and let Outlook synchronize the data. Then, export the synchronized data to a PST file using the Outlook import/export wizard.
Use an IMAP account: Create an IMAP account and configure it in Outlook. Move the data from the OST file to the IMAP folders. Once the synchronization is complete, configure another Outlook profile with the IMAP account and export the data to a PST file.
It's important to note that these methods have limitations and may not work in all scenarios. They require a functional Exchange Server or IMAP account, and the success of the conversion depends on the synchronization process. For a more reliable and efficient conversion, using specialized and best OST to PST Converter software is recommended.
