Apple

Apple's latest operating system, OS X Mountain Lion, has set a sales record.

The company announced today that Mountain Lion was downloaded over 3 million times in its first four days of availability, "making it the most successful OS X release in Apple's history."

Apple launched Mountain Lion last Wednesday, priced at $19.99. The operating system, which is available in the company's Mac App Store, comes with over 200 enhancements, including wide-ranging integration of iOS features, like Notification Center, Apple's Game Center, and iMessage. Facebook integration is making its way to the operating system in the fall.

AirPlay Mirroring, notes, and reminder apps have also made their way to the platform. A Power Nap feature will ensure Macs stay up-to-date even while asleep, and a new security tool called Gatekeeper will help fend off malware by controlling application installation.

Mountain Lion replaced Lion. Apple announced last year that Lion topped 1 million downloads in its first day of availability. The company didn't say how many downloads Mountain Lion was able to nab in its first day.

CNET's Jason Parker recently reviewed Mountain Lion , and awarded it four stars out of five for its "improved core apps and new features." Parker said that the operating system is "well worth the $19.99 price."

This story has been updated throughout the morning.