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Running unnecessary add-ins may make Outlook slower and even cause stability issues.
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If the above steps did not help, please try renaming outcmd.dat, extend.dat and Frmcache.dat as described in Part 2 of this article. In addition to PST, OST and profiles, Outlook has several other files which might get corrupted. In this case, you have to create a new profile. Sometimes an Outlook profile might get corrupted. Note: This operation might take a long time if you have a large Exchange mailbox, but you can still use Outlook while it happens.įor a non-Exchange account OST, such as IMAP, use the ScanPST method in the first section of this article.
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If you have an Exchange (or Office 365) account, you have an OST file. Corrupted PST fileīy far the most common reason for Outlook crashes, instability and unexplained weird behavior is a corrupted PST or OST file. If you are experiencing issues with your Outlook, try these items one-by-one and hopefully one of them will help. This article describes some of the most common reasons that cause Outlook to become unstable, crash, hang or freeze.