After upgrading to Windows 10 I deleted and tried adding my Various accounts to the Inbuilt Mail App.
I tried my Outlook.com account first and was greeted with a 0x85050013 error. The same When I tried adding my Gmail account. The blueyonder one which I entered as an IMAP account seemed to go OK but then didn't actually add the account at the end.
Taking a leaf from the issues others had with sending mails over Outlook2013 I tried the following:-
Right click start button
Select Command Prompt (Administrator)
Type sfc /scannow and let it complete
Reboot your PC
This seems to fix some corrupted files across the board (Although it does report a few files not fixed) After doing this I was able to add the accounts into the Mail App.
Only use Helpful answer if your problems been solved.
It's a Windows issue - the win 10 upgrade damages some existing files. The fix restores the damaged files. Why on earth would it be a VM issue? Good luck with asking Microsoft on this one. At least VM have posted the fix on this Forum for all to see easily and with full instructions.
Superuser 2016/17 Use Kudos to say thanks Mark answer as "helpful" only when the problem is solved Please don't send me private messages unless I ask you to. I do not work for VM. The advice I give is based on my best understanding of VM policy and practice. You rely on it at your own risk.