Mac OS X Leopard build 9B18

Mac OS X Leopard build 9B18 is a build of Mac OS X Leopard 10.5.1, released on 15 November 2007. This version was the first to support the 2008 Mac Pro (although the RTM build can still be installed on that system), and also was the version shipped on most retail copies of Leopard in the first half of 2008, after which 10.5.4 took over.