OEM Service Release As later versions of software are available to OEMs, the OSR number will change Windows 95, for example, has a retail version which is called just Windows 95 or Windows 95 gold, then the OSRs: Windows 95 OSR1, Windows 95 OSR2 0, Windows 95 OSR2 1, and Windows 95 OSR2 5 which are installed by the OEMs