The Windows NT operating system line is quickly approaching the end of its supported life. As of July 1, 2003, Microsoft discontinued support for Windows NT Workstation 4.0. Its primary method of support is now online newsgroups and consulting firms.
Windows NT Server 4.0—including Standard, Enterprise Edition, and Terminal Server Edition—will follow suit at the end of 2004. In addition, as of Jan. 1, 2004, Microsoft will no longer provide nonsecurity hot fixes for Windows NT Server 4.0. While Microsoft will continue to provide online support forums for a year after official support ends, these forums are insufficient for system emergencies that require a high level of support.
Discontinuation of support for NT doesn't mean that you have to replace it. Thousands of companies still rely on this OS for their everyday computing needs. However, if you require a high level of support for your systems, you should begin to investigate a reasonable migration to Windows 2000 or Windows Server 2003.