Security vendors holding off on 64-bit Windows
Companies looking to become early adopters of Windows x64 Edition have one more reason to postpone the decision: They may find that their favorite antivirus software no longer works on their new desktops.
Though Microsoft maintains that most software written for older, 32-bit versions of Windows is compatible with the 64-bit version of the operating system, released last April, changes to the core, kernel component of Windows means that certain types of software need to be rewritten for the company's 64-bit versions of Windows.
By Robert McMillan at InfoWorld.
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