Outlook crashes due to large mailbox — how to fix?

sanmart

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Aug 23, 2025
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A large mailbox is one of the most common reasons Outlook Keeps Crashing frequently. As emails, attachments, and folders increase, the PST file becomes heavy, and Outlook struggles to load it. Initially, you can fix this by restarting Outlook, disabling add-ins, and rebuilding the PST file. Repairing Microsoft Office also helps if Outlook files are affected.

However, when the mailbox size causes PST corruption, Outlook may crash every time it opens. Manual solutions often fail in such situations. Repairing the PST file using a tool like the MailConverterTools PST Recovery Tool helps recover mailbox data and reduces Outlook crashes caused by oversized mailboxes.