Postmortem: The nuke plant failure was widely reported by the mainstream media and there is nothing to add to those reports.

The reason our power was affected was that one battery in the battery bank for the third floor UPS failed before the generator could come up to speed. The entire battery bank has been replaced.

Update: LDAP server and SMTP servers are up.
Update: All IMAP servers and IMAP/POP3 muxes are up.
Update: Imap servers ms1.mxes.net and ms3.mxes.net are up.

Working to determine the extent of the problem. Most services are down.