Q: Will Windows 2000 work with 64 bit processors? (from Winmag)
A: Windows 2000, like NT 4.0, is a 32-bit operating system, though it is being enhanced to support more than 4GB of physical memory. Windows 2000 Server, Advanced Server and Data Center Edition all support a new Enterprise Memory Architecture supported by Intel's Xeon processor and Compaq's Alpha. This allows addressing up to 64GB of physical RAM (32GB on Alpha-based systems) by 32-bit applications. However, the application in question must be specifically written to exploit the new memory model. Windows 2000 itself can exploit the additional RAM as a disk cache and to minimize swapping. Microsoft does have a true 64-bit operating system under development (Windows XP), but it's not expected to ship for another year or more.