A user had problems setting up his Exchange account in Outlook 2016 on his Surface. I can set the profile up in the control panel without issue. But when Outlook is opened, an error - Cannot create profile... exchange.ost is not an outlook data file - comes up and Outlook closes. Other user accounts/profiles will work fine. His profile works fine on other devices.
I've tried removing the newly created ost.
I've tried removing the profile from the Mail Control Panel and recreating the profile - numerous times under different names.
I've tried cleaning out anything that looked relevant in the Outlook folders in App Data.
I found a registry key in HKCU>SOFTWARE>Microsoft>Office>16.0>Outlook>PST called LastCorruptStore and tried removing it.
I've tried Outlook in safe mode - (other users/profiles work without being in safe mode).
It seems like something he did the first time he tried to set things up failed, and I can't seem to get the Surface to forget it.