One of the user outlook hangs and restart automatically if user hover on Calendar. (refer attachment)

Hi,

Have you checked the Event Viewer? Is there any related log about Outlook crashing?

If we click View tab > To-Do Bar and then enable Calendar, will Outlook hang again?

We can also try starting Outlook with /resetnavpane command to see if this can fix the issue. To do this, exit Outlook, press Windows key + R to open the Run command, type outlook /resetnavpane and press Enter.

In addition, the Calendar peek shows items happen in next 7 days, if there is any item that is corrupt, this issue may also happen. Please go to your Outlook Calendar and check if there is any meeting item that may be corrupt in the next 7 days. You may try using the Calendar Checking Tool for Outlook to do the job. See:

https://support.microsoft.com/en-us/kb/2964632

Please let me know the result.

Regards,

Steve Fan
TechNet Community Support

It has been fixed but running calcheck with -f