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PST is not a outlook data file error

Last Modified: 2015-10-06

I have used Outlook 2013 to export IMAP emails from Gmail account, and I have successfully exported each month of email into separate PST files so that I can move these PST files over to another computer.

I need to import these PST files into Outlook 2010. But some PST files are showing error message as below. I can import these pst files back into Outlook 2013 and they work fine but when they are moved to Outlook 2010 some PST files show the error message.
PST Error
The reason I need to import these into Outlook 2010 is that we are in the process of migrating gmail to Exchange. I also need to make all email as PST files so they can be stored in a file server where computers can import them into their outlook whenever they need.
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