- My mail was inaccessable for about 30 minutes.
- After the change, all of my mail was marked unread. (I have about 4000 messages in my inbox, and about 450 of them were supposed to be unread.)
- All of the messages were timestamped at the time of the changeover, rather than at the time they were originally received.
- I haven't received any new mail since the changeover, including the test messages I've sent myself.
Luckily I realized there was a problem in time to back up my folders, so I've likely fixed problems 2 and 3. It would have been catastrophic had I not been able to do that. Seriously, I'd have been "off" for months.
But yay for budget hosting, eh?