Sorry about that, folks.
The server went down sometime overnight and the server admin didn't get automatically notified, as he normally is. So he was faced with a smoking mess of server when he got into the office this morning. (Happy Thursday, Mr. Server Admin!)
The problem was hardware related: apparently our offsite back-up drive died and took everything down with it.
But now it's fixed.
And the admin is going to put a fix in place to make sure he gets ALL the problem alerts.