Most free support for Windows 2000 ends June 30, 2005, although paid (Extended) support will be available after that time. Extended support for Windows 2000 will end two years after the successor to the Windows Longhorn client ships; that end date would be around 2010 on current schedules. No further service packs are planned for Windows 2000, but an update rollup package of high-priority bug fixes is planned for early 2005. Microsoft products are normally supported only with the most recent service pack, so customers will have to move to SP4 to get support for Windows 2000.

Support for Windows NT 4.0 Workstation ended June 30, 2004. However, through 2006, Microsoft will offer some support, including security fixes, to organizations with a custom support contract that are migrating from NT 4.0 to newer Windows versions.

Windows XP Mainstream support, originally scheduled to end fairly close to the release date of Longhorn, will now end two years after that release date-an end date of around 2008.

Windows 2000 and Windows XP are the only fully supported Windows client OSs as of June 2004.

All support for Windows NT 4.0 Workstation ends June 30, 2004, and only security-related hotfixes are available in the meantime.

The extended support phase for Windows 98, Windows 98 Second Edition, and Windows Me ends June 30, 2006. This is a major extension of time for these products: Windows 98 was scheduled to exit the extended support phase on Jan. 16, 2004, and the other two versions were due to leave the extended support phase Dec. 31, 2004.

Microsoft products are normally supported only with the most recent service pack, but customers receive one year, and sometimes two years, to migrate to that service pack. This means, for example, that Windows 2000 Professional with Service Pack 3 will be supported until June 26, 2004.

Windows XP Mainstream support, originally scheduled to end fairly close to the release date of Longhorn, will now end two years after that release date.

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