BarOS 10 is the tenth version of BarOS in the Progresh lineup. It is based on Mac OS X 10.0, released on 24 March, 2001. According to the about box, this system was released in 1999. This is the first BarOS system with icons that look more realistic. pBar 63 is based on the iMac G3 with slot-loading drive. This is the first BarOS system that changes the color of the pBar depending on the theme that you're using. The second one is BarOS 12.