Outlook has been hanging on me for the last couple of days. Turns out it is related to the Skype Add-in. I disabled the add-in and it’s fine now…but I won’t be able to use Skype integration until that issue is fixed. If you want Outlook back and don’t mind going without Skype for a while then do this:
1. File -> Options -> Add-ins -> Manage COM Add-ins -> Go
2. Uncheck “Skype Meeting Add-in for Microsoft Outlook 2016”
3. Click OK
4. Restart Outlook
You should now be able to open appointments.