Windows Throwback

Windows Throwback (stylized as #throwback) was a Windows version released to mark Windows’s 30th anniversary in 2015. It had previous versions of Windows all merged into one big OS. It had old features and applications (such as Microsoft Agent, Active Desktop, widgets, etc) and old themes (Windows Classic, Luna, Aero)

List of Windows versions included
 * 1.0
 * 3.1
 * 95
 * NT
 * 98
 * 2000
 * XP
 * Vista
 * 7
 * 8.1
 * 10