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This happens if your profile or installation is damaged. Why the set of folders cannot be opened in shared calendar?įile corruption is a common problem in Outlook, and many reported that The folder cannot be expanded. Change the value of AllowUnregisteredMapiServices DWORD Delete the Outlook key from your registry Stop all Outlook processes running in the background Remove Outlook account and remove its files Use Microsoft Support and Recovery Assistant Reinstall Outlook and remove its values from the registry Run Outlook as administrator and turn off the Compatibility mode Remove the user from delegates and add them back again Make sure to install 64-bit version of Office Don’t install Exchange Server Cumulative Update

Be sure to use a separate password for Outlook Fix Microsoft Outlook error: The set of folders cannot be opened.Why the set of folders cannot be opened in shared calendar?.

The subject line reads, "Modification Resolution".Home › Outlook › Fix › The set of folders cannot be opened They're always in the Unread Mail folder, but I can't find where that is. It's more like a log that, I guess, Exchange is sending me.

Sometimes, such as today, I get these odd messages in Outlook. It never says, "Microsoft 365".) And for our backend, we use a Microsoft Exchange 2013 server. (Yes, I know it's supposed to be Microsoft 365, but the Admins do their best to keep things back, so whenever I get into Outlook, it says "Outlook 365". At work I have Office 365 for Business, so I've got Outlook 365.