eSoftTools OST to PST Converter Tool, which converts Outlook OST files to Outlook PST format with ease. This program works for all versions of Microsoft Outlook. The file size has no impact on the quality of the conversion. This software still saves OST emails as new Outlook PST emails, along with all to, cc, bcc, and from addresses, as well as the date and time. You can get a free preview edition by clicking here.
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