Note that you can only upgrade to an equivalent or higher operating system. You can’t “downgrade” to a less powerful operating system, as some functionality might be lost in the process. This means you can’t move from Windows NT Server 4.0, Enterprise Edition (or other server products in the Windows NT Server 4.0 family), to Windows Server 2003, Standard Edition, without removing the earlier operating system and performing a new installation.
Also note that Datacenter Edition—which provides an integrated hardware, software, and service offering—is not available as an upgrade. It can be purchased through the Windows Datacenter Program and is delivered by Microsoft and qualified server vendors, such as original equipment manufacturers (OEMs).
For more information, see Windows Server 2003 Support at http://www.microsoft.com/windowsserver2003/support/ or the online Product Documentation for Windows Server 2003 at http://www.microsoft.com/windowsserver2003/proddoc/.
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