A Macbook Air laptop, an iPad 2 and an iPhone sit on display in a store window.

Editor’s Note: Pete Cashmore is founder and CEO of Mashable, a popular blog about tech news and digital culture. He writes regular columns about social media and tech for CNN.com.

Story highlights

Desktop operating systems will merge with mobile OS in the coming years

Music, photos, calendars and emails now sync across your phone, tablet and Mac

But simple systems are often less "open" and provide less freedom to try new things

CNN  — 

Apple released Mountain Lion to developers last week, a new operating system that will make your desktop computer work more like your phone than ever before.

The trend is clear: The desktop operating system will merge with the mobile OS in the coming years. The question is: Why?

Let’s start with the trend itself. First off, Apple is integrating cloud services much more deeply in Mountain Lion than any previous operating system. That means your music, photos, calendars, contacts, emails and more can now stay in sync across your phone, tablet and Mac.

Apple has also unified your messages across your devices: The Message app (formerly iMessages) will replace iChat on the Mac.