Major VersionsFollowing are the some of the milestones achieved by Microsoft in Windows server technology.
Windows NT 4.0
NT Server 4.0 EnterpriseIn the year 1997, NT Server 4.0 Enterprise was introduced. This was an updated version of NT Server 4.0 and contained transaction server which was to perform multiple functions in parallel and then integrate those functions. This version was basically geared towards corporate sector and large organizations.
Windows NT Terminal Server EditionAnother major update to the server technology was introduced with the advent of Windows NT Terminal edition which has the capability of connecting to non-window based clients as well.