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how much RAM the various Windows versions and editions support?

Here's a list of how much RAM the various Windows versions and editions support (as of May 2010):

Windows NT 4.0: 4 GB
Windows 2000 Professional: 4 GB
Windows 2000 Standard Server: 4 GB
Windows 2000 Advanced Server: 8 GB
Windows 2000 Datacenter Server: 32 GB
Windows XP Professional: 4 GB
Windows Server 2003 Web Edition: 2 GB
Windows Server 2003 Standard Edition: 4 GB
Windows Server 2003 Enterprise Edition: 32 GB
Windows Server 2003 Datacenter Edition: 64 GB
Windows Vista: 4 GB
Windows Server 2008 Standard: 4 GB
Windows Server 2008 Enterprise: 64 GB
Windows Server 2008 Datacenter: 64 GB
Windows 7: 4 GB

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