Turning off the cache mode will force Outlook to re-sync and download folders and mails back again. The cache files could be responsible for the folder acting weirdly. Turn it off, save settings, close Outlook, and relaunch to try again. Uncheck Use Cached Exchange Mode here and save settings. Double-click on the email ID which is throwing the Cannot expand folder error. You will see a list of all email accounts now. Is it happening on an Exchange account or in a shared mailbox? If that’s the case, turning off the cache mode could help resolve the Cannot expand folder error in the Outlook app.Ĭlick on Account Settings and select Account Settings from the drop-down menu. If the error is gone, you will need to re-enable each add-in one at a time to verify which one was responsible for the error. You can also disable all add-ins without going into Safe Mode. Open Outlook in Safe Mode to eliminate all add-ins issues. Have you installed add-ins in your Microsoft Outlook account? One or more of the add-ins may be causing a conflict resulting in the Cannot expand folder error in Outlook. Microsoft notes that you may face performance issues if the limits are breached.
Moreover, the number of items per folder cannot exceed 100,000. That limit applies to Microsoft Exchange accounts. If you have more than the specified number of sub-folders, the folder will not expand. Microsoft Outlook has a limit of 1000 folders.
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