If you want to open an OST file in Outlook, but the file has become orphaned or inaccessible, then eSoftTools OST to PST Converter Software is the best solution. Outlook normally only opens OST files that are linked to the same Exchange profile, but with this tool, you can convert the OST file to PST format and easily open it in Outlook. This software safely recovers complete mailbox data such as emails, contacts, calendars, and attachments, and also maintains the original folder structure.

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