Apple just released a preview of their next operating system called OS X Mountain Lion to OS X developers. If you have a development account you can get the preview in the portal.

There are a ton of new features. Most of them are pulled straight from iOS such as, iMessages, Notification Center, and Game Center. The developer preview of Mountain Lion also introduces Gatekeeper, a revolutionary security feature that helps keep you safe from malicious software by giving you complete control over what apps are installed on your Mac.

As a bonus, Apple also released a public beta version of the new iMessages app. This new messaging application will replace  iChat. Go and grab the public beta and test it out.

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