Apple announced its new operating system, dubbed Mountain Lion, this week. The software will have a variety of new features incorporating parts of the company's mobile operating system, iOS, into the OS for Mac computers. Apple dropped the name Mac from its operating system, potentially paving the way for OS X Mountain Lion and iOS to become one in the same. Mountain Lion will get features such as Message, Contacts, Notes, Game Center, and offer integration with Twitter and Apple's iCloud service. Apple shares crossed a milestone this week, moving past the $500 mark for the first time as investor optimism continues to increase. The iPhone maker was also named the top American brand in a reputation study. Apple shares closed the week up 1.7%, gaining $8.70 to close at $502.12.