Windows XP supported upgrade paths (292607)

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Microsoft Windows 3.x

Microsoft Windows 95

Microsoft Windows 98, Microsoft Windows 98 Second Edition, Microsoft Windows Millennium Edition

Microsoft Windows NT 3.51 Workstation

Microsoft Windows NT 4.0 Workstation

Microsoft Windows 2000 Trial Edition

Microsoft Windows 2000 Professional

Microsoft Windows NT 3.51 Server

Microsoft Windows NT 3.51 Server with Citrix

Microsoft BackOffice Small Business Server

Microsoft Windows XP Home Edition

Microsoft Windows XP Home Edition with SP1

Notes

• Microsoft does not support upgrading Windows XP Home Edition with Service Pack 1 (SP1) to Windows XP Professional without SP1.
• All versions of Windows NT 4.0 (Windows NT Workstation, Windows NT Server, Windows NT Server Enterprise Edition, and Windows NT Server Terminal Server Edition) must have Service Pack 5 installed before you can upgrade to Windows XP. However, as noted earlier in this article, you cannot upgrade any of the Windows NT 3.51 Server products to Windows XP Home or Windows XP Professional editions. To obtain Windows NT Service Pack 5, visit the following Microsoft Web site:

  http://www.microsoft.com/windows

Microsoft Windows XP Media Center Edition

Note Windows Setup gives an error message that the Product Key is not valid (invalid) if you attempt an upgrade or repair the installation with Microsoft Windows XP Home Edition or with Microsoft Windows XP Professional.