Funny how that myth is easily propagated
What makes Vista more secure than XP ? The UAC ? You can disable it, and I'll bet that any user spending a day on the thing will end up doing so if only to save his sanity. Besides, the UAC does not prevent users from blindly clicking OK like they usually do.
What else do we have, the integrated firewall ? It's only marginally better than XP SP2 if I'm not mistaken, but apparently it does block outgoing stuff, so it IS better.
Unfortunately, a software firewall is something you can get for free anyway, so it's not really a Vista advantage, now is it ?
What else is secure about Vista ? Ah yes, the fact that hardly anyone is using it. That's undeniably a point in its favor.
But it's also the only one.