Exchange support on my MacBook Pro to use work email has been an adventure for the last year or so. Exchange support in 10.7 Lion was a disaster; it would take Mail.app at least 30 minutes most mornings to connect to the server and get my mail updated for the morning, and I consistently encountered message flag errors that caused freezes that necessitated force-quitting and restarting Mail.
MacOS 10.8 Mountain Lion this summer fixed the freezes associated with Mail.app changing flags on messages, but a new problem was introduced — I was entirely unable to check my email from home. It wasn’t a server issue — I could check my account perfectly fine using a webmail interface or by using Outlook, but Mail.app refused to connect to the account from my house.
10.8.1 came out this week, and that problem is now solved as well. That really cleans up my major gripes with MacOS lately — and, really, that wouldn’t have mattered much either if BSU wouldn’t have switched to Exchange.
My only other current annoyance has to do with iCloud and how it handles documents. I’ve been using Pages to write news release drafts and saving them into iCloud. If I open a document and wait a bit to save it, I end up with “Untitled.pages” documents on iCloud that aren’t deleted automatically when I finally save the document and assign it a filename. So a couple of times a week I go into iCloud and delete a bunch of stuff that looks like “Untitled 2.pages.”
Still, even with that minor gripe, so far I’m enjoying Mountain Lion very much.