Here is another Compelling Reason why not to Upgrade to Vista and Switch to REAL OS Like Linux or OS X

Symantec sees an Achilles' heel in Vista | CNET News.com
Some of Microsoft's efforts to make Windows Vista its most stable and secure operating system ever could cause instability and new security flaws, according to a Symantec report.

Researchers at Cupertino, Calif.-based Symantec examined the new networking technology in recent test releases of Vista, Microsoft's next major operating system release, according to the report. They found several security bugs and determined that Vista's networking technology will be less stable, at least in the short run, than Windows XP's, the report said.