A screen shot of Mountain Lion, Apple's new operating system,...

A screen shot of Mountain Lion, Apple's new operating system, which is to go on sale this summer. Credit: AP

Apple said the new software will be on sale this summer, a year after it released the current operating system, Lion. The preview version will help software developers make products that take advantage of the new features of the operating system.

Mountain Lion will include Game Center, an iPhone app that stores high game scores and helps users find opponents. It will be integrated with iCloud, the new Internet storage service designed for the mobile devices.

The new Messages app, also copied from the mobile operating system, will replace iChat. Lion users can download a preview version of the app for free.

A new Notification Center will show alerts from email and calendar programs, just as on the iPhone.

Apple started the trend of making its Mac operating system more like its phone and tablet operating system, iOS, with the release of Lion. It borrowed phone features like a screen that shows all installed apps, and expanded the range of gestures that can be used to control a MacBook through the touch pad.

The Cupertino, Calif.-based company sells Lion for $30. It didn't say what Mountain Lion would cost.

Apple has been growing Mac sales in a nearly stagnant PC market, but the sales aren't growing as fast as those of the iPhone. In 2010 iPhone sales overtook those of Macs for the first time.

Apple has been using the names of big cats to differentiate its OS versions since 2001.

NewsdayTV's Doug Geed shows us some great spots 'Out East' to visit this summer. Credit: Brian Jingeleski, Randee Daddona

Out East Show: LI Aquarium, Patty's Berries and Bunches, Palmer Vineyards NewsdayTV's Doug Geed shows us some great spots 'Out East' to visit this summer.

NewsdayTV's Doug Geed shows us some great spots 'Out East' to visit this summer. Credit: Brian Jingeleski, Randee Daddona

Out East Show: LI Aquarium, Patty's Berries and Bunches, Palmer Vineyards NewsdayTV's Doug Geed shows us some great spots 'Out East' to visit this summer.

SUBSCRIBE

Unlimited Digital AccessOnly 25¢for 6 months

ACT NOWSALE ENDS SOON | CANCEL ANYTIME