None of my push or fetch email accounts work anymore. I have tried restoring and even wiping and starting over. Everything was fine for a day after the 2.1 upgrade but then it all went to crap. Apparently it is a pretty big issue: http://discussions.apple.com/thread.jspa?threadID=1708956&tstart=0 with several of the posters on the apple discussion thread stating that they have been told by Applecare it is a widespread problem. The mail accounts that are failing are MobileMe (push), Gmail (fetch) and my corporate exchange (push). Calendar app is failing now too, I guess because it cannot sync from exchange. Anyone else having this problem.