Announced by Sun Microsystems in July 2005, OpenSSO was based on Sun Java System Access Manager, and was the core of Sun's commercial access management and federation product, OpenSSO Enterprise (formerly Sun Access Manager and Sun Federation Manager).
2005 júliusában a Sun Microsystems bejelentette, hogy az OpenSSO a Sun Java System Access Manager-en alapul, és ez lesz a magja a Sun kereskedelmi elérésmenedzsment és federációs termékének az OpenSSO Enterprise-nak (korábban Sun Access Manager and Sun Federation Manager).