Apple unveils preview of new Mac operating system

Apple released a preview version of its new Macintosh operating system on Thursday, bringing some features of the iPad to the personal computer.

New Messages application which replaces iChat

Apple said Mountain Lion includes a new Messages application which replaces iChat and allows a user to send unlimited messages, photos and video from a Mac to another Mac or a device running iOS software just as the iPad or iPhone.

It as well includes integration with Twitter allowing users to sign in and tweet directly from Safari, Photo Booth and third-party applications, Apple said.

"More than 100 million users have iCloud accounts, and Mountain Lion makes it easier than ever to set up iCloud and access documents across your devices," Apple said.

A new security feature called Gatekeeper protects the computer against malicious software by giving the user control over what applications can be installed and downloaded, Apple said.

Apple chief executive Tim Cook told The Wall Street Journal in an interview that the new Macintosh operating system takes advantage of features popular on the iPad and iPhone.

Lot of apps

"We see that people are in love with a lot of apps and functionality here," Cook said of the iPhone. "Anywhere where that makes sense, we are going to move that over to Mac."

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