Does anyone else have all their messages missing? I should have five pages of worth, and they're all gone!

Yes, this issue is being addressed in the "New Server Time" thread in the link below.

https://umd.net/forums/new-server-time

Messmaster last indicated that he was doing a site rollback to essentially system restore. Mail functions are down at the moment.

Personally, I'm show a new mail notification but there is nothing there. Not his ideal Saturday night plans but I'm sure he'll have it back up as soon as he can.