Mail
Mail App and Exchange still stinks. New message comes in, and if you click on it, and it shows "Loading..." then the fan kicks in and stays on forever, and the message won't open. I can go to my iPhone or iPad and the message is fine; can open it, and reply, etc.
Decided to delete and recreate the account. Reopened mail, and all of the messages are there, except for today's. Did a Sync and waited an hour, nothing.
Pretty much garbage IMO. I think the last time Mail was any good with Exchange support was Leopard. Since then it's been a dismal death spiral. If they don't want to support it, then don't. Do it right or get rid of it. What I don't get is that it works great on iOS...?