Sophos is recommending that system administrators ask their security vendors if they are capable of properly protecting them on the forthcoming 64-bit version of Vista, as arguments continue regarding access to Microsoft's operating system code (kernel). Sophos has reassured its customers that Sophos Anti-Virus will offer full protection against malware threats on Vista, and suggests that some security vendors may not have given sufficient thought to the new operating system when developing their products.

Anti-virus firms Symantec and McAfee have recently made high-profile complaints that they are being "locked out" of the Vista operating system kernel by Microsoft's PatchGuard prevention system. They argue that this is preventing them from continuing to develop pro-active protection against new malware, sometimes referred to as 'host intrusion prevention' or 'HIPS'. They claim this action is anti-competitive.

However, Sophos argues that its approach to HIPS technology has met with no problems on both the low-spec and high-spec versions of Windows Vista. In addition, Sophos claims that Microsoft has so far provided all the interfaces that Sophos needs for providing this form of protection.

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