NT did not support Plug and Play, which was later added in Windows 2000 and XP (also based on the NT core technology). Clustering and failover was added to Windows NT 4 Server, Enterprise Edition.

Windows NT 4.0 Service Pack 6a (SP6a) resolves the SP6 issue with Lotus Notes and other Winsock based applications and provides the latest updates to Microsoft Windows NT Workstation 4.0 and ...