I thought is was noteworthy because, at least in my experience, it's the
first time the Tool was offered on Windows Update, and if you read the KB
Article from the "View details" link in the Windows Update window, Vista
isn't mentioned, yet, at least, under "Applies To" in the article. So, on
Vista it was something new, rather than the usual Defender definition/engine
updates and Driver updates, which is all I had ever seen listed.
I just ran it on Vista this morning, and on my XP partition I do run it
every month, because it can't hurt to check, and it's pretty fast. Malicious
Software has never been detected. I don't use an Anti-Virus program, per se.
Dean