Office 365 outlook "The set of folders cannot be opened" for shared calendars

I have been having issues with shared calendars on my O365 Outlook desktop app. When I try to open a shared calendar I get "The set of folders cannot be opened" , my coworker who I share the calendars with has no issues at all.

I am running a Win 10 Enterprise box with 365 apps for enterprise. I've tried a few Band-Aid fixes that work for a little bit but then this issue comes up again

Fixes I've used:

1. create a new outlook profile

2. Open outlook in the 365 web browser, open the calendars, then open my outlook desktop app

3. Update Outlook

Let me know what you guys think!

2

2 Answers

As opening Outlook in safe mode worked, the problem is with some installed extension.

Open Outlook menu File > Options > Add-ins, next to "Manage: COM Add—ins" click "Go...".

Uncheck the add-ons selectively, click OK, restart Outlook and test.

Once you find the bad add-on, either use the Remove button to delete it, or search for a newer and better version of it.

1

According to you description, I noticed that you have tried to start Outlook in safe mode and the issue didn't occur. Agree with @harrymc, you can try to disable all the add ins and check which add ins cause it one by one.

If it doesn't work, as I know, Outlook has disabled some features other than add ins that may cause problems in safe mode. In addition to disabling the add-on, we can also use the following methods for troubleshooting:

1.Clear and regenerate the navigation pane of the current profile through Win+R > Outlook.exe /resetnavpane (note that there is a space between "Outlook. exe" and "/"):

2.If the problem is caused by an error in the custom toolbar, you can try to solve it by resetting the toolbar via File > Options > Customize Ribbon > Export all customizations first to back up > Click Reset above Export option.

3.Reset all settings of Outlook under the registry:

(Note: Serious problems can occur if you modify the registry incorrectly. Before making changes, back up the registry to restore it in case something goes wrong.)

First enter Win+R to open Run window, and type Regedit to open Registry Editor:

Then navigate to Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook:

Rename the "Outlook" folder to "Outlook-1" and restart your outlook client to see if the problem is resolved.

Hope the above help!

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