For a brief period of time yesterday, there were updates for Office v.X as well as Office 2004 available on Microsoft's website as well as via Microsoft AutoUpdate. Both releases contained "several updates to enhance security and stability, including fixes for vulnerabilities that an attacker can use to overwrite the contents of your computer's memory with malicious code."
For a while, the patches were still showing up when you ran AutoUpdate, but the Download links on this page and this page produced 404 Not Found errors. The links still go 404, and now the updates aren't showing on AutoUpdate either. Both updates are still listed here, but you'll still end up in the land of 404 if you follow the breadcrumbs.
Has Microsoft pulled the updates intentionally because they found a bug in the updates or updaters themselves (release early, test late?) or has the file server simply "misplaced" them? Should the folks who already updated yesterday from AutoUpdate be worried? Should the folks still waiting for the update be worried? Somehow I doubt that whole icon thing is responsible for knocking the Mac BU this much off their game. So what's up, Mac BU?
If and when Microsoft resumes its update schedule, we'll let you know. Meanwhile, try not to associate with any known malicious hackers.
UPDATED 11:00am ET: Please see "Microsoft Security Response Center says yesterday's Office Updates were a mistake"