Recently I upgraded one of my machines only to find out that some Outlook plugins that I need were incompatible.

The 2010 edition still installed wasn’t functioning properly, so I also removed the recent 2016 upgrade only to find out that everything I did resulted in this error

“NOT IMPLEMENTED”  or “CANNOT SAVE, NOT IMPLEMENTED”  basically my email was broken, my calendar was broken I couldn’t do anything.

The MAPI upgrade from Office 2016 remained after uninstall.

Close Outlook

Go to this folder

C:\Program Files (x86)\Microsoft Office\Office15

Delete / Rename OLMAPI32.DLL  (Remember you have to be admin)

Restart Outlook

Profit.