Windows NT 3.xx

Windows NT 3.xx was released since 1993 and still released on VirtualBox (since 2007)/VMware (since 1998)/Microsoft Virtual PC (since 1997) can refer to either an individual or all of the following versions of Microsoft Windows and Microsoft Windows NT:
 * Windows NT 3.x0 (released since 1993)
 * Windows NT 3.5x (released since 1994)