After giving the Customer/Technical previews of Windows 10 a wide berth (just haven’t had the time to play with them) I’m now finding I quite like Windows 10 on my Surface Pro 3 (i5 128GB); an interesting issue though – whenever I launched the new Mail app I found I was presented with the error message-
Your Outlook account settings are out of date.
Clicking the Fix account button didn’t seem to do anything…
However I then realised since the upgrade to Windows 10 I had only been using the PIN I defined back on Windows 8.1 to login (and as such had not yet provided Windows 10 with my Microsoft account password).
So after logging out and then logging back in again this time clicking the Sign-in options and then the full password option (as seen below) I found that clicking the Fix account button did actually this time fix the account.