A. Windows NT Terminal Server Edition is supplied with Service Pack 3 built in. The following Service Packs are available for Windows NT 4.0 Terminal Server Edition.

Service Pack 5 - http://www.microsoft.com/ntserver/terminalserver/downloads/recommended/tsesp5/
Service Pack 4 - http://www.microsoft.com/ntserver/terminalserver/downloads/recommended/tsesp4/

Special hotfixes (when available) can be downloaded from ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT40TSE/hotfixes-postSP3