ULTRA RARE: Microsoft Windows 2000 Professional Beta 3 RC1 Build 2000

ULTRA RARE: Microsoft Windows 2000 Professional for Alpha (not x86) Beta 3

ULTRA RARE: Microsoft Windows 2000 Server for Alpha (not x86) Beta 3

ULTRA RARE: Microsoft Windows 2000 Server x86 2000.3 Beta 3 Release Candidate 1!

ULTRA RARE: Microsoft Windows NT 5 Workstation (Win2K) Beta 1

ULTRA RARE: Microsoft Windows 98 Second Edition Beta 1 Build 2106!

ULTRA RARE: Microsoft Windows NT 4 Server SUR Beta CD from PDC 1996!

ULTRA RARE: Microsoft Windows 2000 Professional Beta 3 (Training Variant)