(Symantec has issued a correction to this statement saying: "Microsoft is not providing outside security vendors with timely access to technical information for Windows Vista as they have with past operating systems.  As a result, outside security vendors cannot develop compatible security solutions in a timely manner and customer choice will be limited.

"Customer choice for security solutions will also be limited because of Microsoft’s installation of PatchGuard, which will not allow independent security solutions to interact and be compatible with the core of the Windows Vista operating system, forcing customers to use only Microsoft security solutions.”)

Turner said that Microsoft's actions mean that security vendors will not be able to have products ready for the release of Vista.

"The effect of this will be to limit the choice of consumers to just Microsoft's own security products on release," Turner said.