I get the message:
Cannot start Microsoft Outlook. Cannot open the Outlook Window. The set of folders cannot be opened. The file C:\Users\Ian\Documents\Outlook Files\*****@******.*** cannot be opened.
Since contacting you I have restored Windows 8.1 but still have the same problem with Outlook 2013.
After much angst yesterday evening, I was eventually able to open Outlook in safe mode, and now it is working normally, albeit of course I am back in the Windows 8.1 OS. I am unwilling to retry Windows 10 until Microsoft has resolved what appears to be a common issue with Windows 10 and Outlook 2013.