ASKER
The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.
TRUSTED BY
https://www.experts-exchange.com/questions/26839310/AD-Dc-dcpromo-failing-say-the-domain-functon-level-is-2000.html
Check this as well
http://www.petri.co.il/windows-server-2008-adprep.htm