OK, people — if your Windows machine was hit with today’s outbreak of the Nimda worm, then that means one of two things: you’re either still vulnerable to a bug that was discovered in October of last year, or to one that was discovered in March of this year. In today’s environment of always-on Internet connections and viruses and worms flying around, there’s no excuse for not staying up-to-date with bug fixes. In this case, there are two important ones, one for Internet Information Server and one for Internet Explorer and Outlook. (Note that the second one is a superceding patch; all of the bulletins point to this patch, but it’s encompassed in the bulletin linked above.) Most importantly, though, sign up to receive future Microsoft bulletins automatically; it’s a no-lose proposition.