A strange one! I received an email, the other day. When I went back, today, to refer to it, using the Mail app on my Surface, it was not there. But, when I searched for the author, it appeared. Went back to the in box and, again, it was not there! Grabbed my phone and brought up mail and there it was. It also shows up if I use Outlook. Tried rebooting, out of desperation but no difference. Anyone else seeing this?