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.
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OU/sub OU helps in representing your set up
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LABs GPOS apply to all lab computers
LAB room1 GPO deploying printer
LAB room2 ...