I'll let Microsoft's own friends do it.
In one case, Danseglio said, a branch of the U.S. government had a malware infestation on more than 2,000 client machines that "was so severe that trying to recover was meaningless. They did not have an automated process to wipe and rebuild the systems, so it became a burden. They had to design a process real fast."
Let's take that a step farther. You also can't trust your data backups, because they might have malware hiding on them. You'll also need to keep your Windows systems constantly updated, because an unpatched XP system that's exposed to the Internet, according to a recent Symantec study, lasted only an hour and 12 seconds before being compromised.
Let's move on, shall we?
And people thought I was hard on Vista!
I don't know about you, but that's got me all excited about Aero.
So, there you have it. A senior Microsoft employee saying that XP can be so thoroughly compromised that you may have no choice but to destroy and rebuild your PCs; a Windows expert's expert dismissing Vista as an "utter disaster"; and an extremely well-respected Microsoft integrator and MVP turning to open-source because it makes better financial sense.
I really don't have to say a thing about Microsoft, do I?
by Steven J. Vaughan-Nichols
[taken from Linux-Watch]