Symantec has made a research and affirming to there research Windows Vista will be more insecure than Windows XP, because most of the new code is fresh, and the old code isn’t used anymore…
Microsoft has removed a large body of tried and tested code and replaced it with freshly written code, complete with new corner cases and defects,” the researchers wrote in the report, scheduled for publication Tuesday. “This may provide for a more stable networking stack in the long term, but stability will suffer in the short term.
Also by using new tehnologies, such as IPv6 and peer-to-peer protocol will be a part of the new insecurity thread:
“As these technologies see wider deployment, we expect IPv6 and the new peer-to-peer protocols to play an increasing role in the delivery of malicious payloads,” the Symantec paper said. “These features are critical to the success of Microsoft’s peer-to-peer initiative but are also the same features that attackers need to deliver malicious content.”
So it seems that besides the system requierments needed for Vista it’s even likely to be used because of the future insecurity issues…