So with the last update, Slow Ring... 10.0.15230.0 the unread email count within the app (not talking about Live Tile) is incorrect. All emails have been read yet, a few out of the five email accounts I have show unread emails when there isn't any. This is true for Comcast.net, Exchange, Gmail accounts.
Nothing so far has permanently fixed the issue, even deleted accoutns and reinstalled accounts only to see the issue come back.
Nothing so far has permanently fixed the issue, even deleted accoutns and reinstalled accounts only to see the issue come back.