The set of folder cannot be opened error is a common error in outlook.
It could be related to ost, pst or the exchange server
We basically use one common step to deal with this issue.
Please watch the video completely to know about the step.
If for some reason you are unable to watch the video please refer the blog:
https://theadmin365.com/fix-set-of-fo...
Also if this doesnt work you can try this :
Resetting the Navigation Panel
Close all apps and programs that are currently open on your PC.
Press Winkey+R on your keyboard – the Run search box should come up.
In Run, type Outlook.exe /resetnavpane and hit Enter. See if Outlook would open now
It basically resets the navigation pane.
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Go to Office.com, click on Admin tab, click on "show all" or/and click on "Service Request" tab, "New service Request".
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