Apple has today released OS X Mountain Lion Server Developer Preview 4 to registered members of its Developer Program. The update brings the Server edition of Mountain Lion to build 12s219n and follows build 12A206j of Mountain Lion Developer Preview 3 which was released yesterday.

Unlike yesterday’s update, developers can log in and grab a redemption code for the download on Apple’s developer site. The ML DP3 update was a stealthier affair, that merely appeared in the Software Update section of the Mac App Store.