It’s confirmed, Windows 8 will have anti-virus rolled into it and it does a wee bit more than you might think.   They have updated and expanded Windows Defender as part of the protection scheme but have also taken advantage of the integration possible when your antivirus becomes part of your OS.  Your boot path will be scanned at every restart to ensure no malware has tainted it and it will be protected while your system is running by Defender, along with a long list of other vectors that are commonly used to attack systems.  You can see a video of this in action over at The Register.

"Rumours about Microsoft planning to bundle an antivirus function in its upcoming operating system have caused quite a bit of a stir in the security community over the past couple of days. Some people have declared themselves supportive of the move, while others rushed to point out its possible drawbacks."

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