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 (Beta versions also included)
 * 1.0
 * 2.1
 * 3.1
 * 95
 * NT
 * 98
 * 2000
 * Neptune 5111.6
 * Whistler 2419
 * Whistler 2428
 * XP (including Embedded, Royale Blue and Noir and Zune themes)
 * Server 2003
 * Longhorn 3683
 * Longhorn 4039
 * Longhorn 4074
 * Longhorn 5048
 * Longhorn 5112
 * Vista
 * 7
 * 8
 * 8.1
 * 10