Late yesterday it was reported that the email system for the White House was offline and there was no estimated time until it would be back up. "Press Secretary Robert Gibbs announced the technical snafu at his 1:30 p.m. briefing, apologizing to the media for the e-mail silence this afternoon."
It appears that it was a server overload as the new administration was migrating their transition email over to the official White House email servers. The outage affects both incoming and outgoing emails. The server being knocked offline is probably not a coincidence after the Obama staff complained that the technology was archaic.
When Obama fought so hard to keep his blackberry for email one must wonder how frustrated he must be when the White House email system goes down. Fortunately for Obama, his blackberry does not use the MS exchange platform.