Download OS X 10.8.1 Mountain Lion Build 12B13 – [Mac Developers]

Following the public release of OS X 10.8 Mountain Lion, Apple today released OS X Mountain Lion 10.8.1 (build 12B13) to Mac developers. With no known issues in the first dev build, Apple has urged the developers to focus on testing Active Directory, Microsoft Exchange in Mail, PAC Proxies in Safari, SMB, USB, and WiFi and Audio when connected to the Apple Thunderbolt Display.

With more than 200 new features, Mountain Lion is the ninth major release of Apple’s desktop operating system. If you haven’t installed the public version, do so now. The OS is available through the Mac App Store as an upgrade to Lion or Snow Leopard users for $19.99, but be warned, the size of the download file is 4.3GB. Existing users can download the delta update of OS X Mountain Lion 10.8.0. The disk image required to perform a delta update to OS X 10.8.1 build 12B13 is only 38.54MB in size.

Facebook integration still hasn’t seen the light of day. Perhaps the feature will be available in an upcoming software update to Mountain Lion including the iMessage phone number merging.

The first developer build of OS X 10.8 Mountain Lion (build 12B13) can only be downloaded by Mac Developer Program members by visiting Apple’sMacDevCenter. A paid developer account is required to download the bits.

Download Mac OS X Mountain Lion 10.8.1 -[Build 12B13]

OS X 10.8 Mountain Lion (build 12B13)