A number of users attempting to upgrade to Mountain Lion, the latest version of Apple's OS X operating system, have mistakenly been issued with activation codes for OS X Server components, according to a report from 9to5Mac. The codes came through Apple's Up-To-Date program, which offers a free edition of the latest OS to all users who bought a Mac computer after Mountain Lion's June 11th announcement. The components that the codes correspond to can only be downloaded by users with Mountain Lion already installed, making them effectively useless.

At least nine posters in the MacRumors Forums have reported receiving OS X Server codes so far. One user speculates that the extra components might be compensation for frustrated customers who have experienced other problems with Up-To-Date. Given that they prevent users from upgrading to Mountain Lion, however, this seems unlikely.