How can I recover data from a large or oversized OST file?

  • September 14, 2026 1:53 AM PDT

    Recovering data from a large or oversized OST file can be challenging, especially when the file approaches or exceeds Outlook’s default size limit and starts causing sync failures or corruption. Before attempting recovery, make a backup copy of the original OST file and avoid making changes to it. For a severely damaged or inaccessible large OST, specialized recovery software can scan the file and extract recoverable mailbox data. The SysInfo OST Recovery Tool supports recovery from oversized and corrupted OST files and provides three recovery modes—Standard, Advanced, and Deep—to handle different levels of corruption. It can recover emails, attachments, contacts, calendars, tasks, journals, and other Outlook items. Users can preview recovered mailbox data before saving it and apply a date-range filter when only specific emails are required. The recovered data can be saved in formats including PST, EML, MSG, DBX, and MBOX. This approach helps preserve recoverable data while creating a separate usable copy of the mailbox.

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