The safest way to recover data from a corrupt OST file is to protect the original file before attempting any repair or conversion. Start by closing Outlook completely and creating a backup copy of the affected OST file. Perform all recovery operations on the copied file so the original remains unchanged if something goes wrong.

If the mailbox is still available on Exchange Server or Microsoft 365, first try rebuilding the OST file. An OST is normally a synchronized offline copy, so Outlook may recreate it after the damaged file is renamed and the account reconnects to the server. Make sure all locally stored or unsynchronized emails are backed up before doing this, as they may not exist on the server.

For an orphaned OST or a file containing unsynchronized data, use a reputable OST recovery or conversion tool. Choose software that offers read-only scanning, mailbox preview, selective recovery, and support for large or severely corrupted files. The recovered data should be saved to a new PST file instead of overwriting the original OST.

After recovery, verify important emails, attachments, contacts, calendars, and folder counts. You can then import or open the resulting PST file in Microsoft Outlook.

Do not repeatedly open, rename, move, or modify the only copy of a damaged OST file. Avoid unknown online conversion websites when the mailbox contains financial, personal, legal, or confidential business information. Local desktop software is usually safer because the data can remain on your computer.

For highly sensitive or business-critical mailboxes, consult an IT administrator or professional data-recovery specialist before making changes to the Outlook profile.

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