Apple announced OS X Mavericks on June 10, 2013, during the company's Apple Worldwide Developers Conference (WWDC) keynote (which also introduced iOS 7, a revised MacBook Air, the sixth-generation AirPort Extreme, the fifth-generation AirPort Time Capsule, and a redesigned Mac Pro). During a keynote on October 22, 2013, Apple announced that the official release of 10.9 on the Mac App Store would be available immediately, and that unlike previous versions of OS X, 10.9 would be available at no charge to all users running Snow Leopard (10.6.8) or later.
On October 22, 2013, Apple offered free upgrades for life on OS X and iWork.
OS X Mavericks is unsupported as of September 2016 and the last released update is OS X Mavericks 10.9.5. iTunes is no longer being updated, but does have partial support for newer devices.
OS X Mavericks can run on any Mac that can run OS X Mountain Lion; as with Mountain Lion, 2 GB of RAM, 8 GB of available storage, and Mac OS X 10.6.8 (Snow Leopard) or later are required.
Mavericks and later versions are all available for free.
The full list of compatible models:
iMac (Mid 2007 or later)
MacBook (Aluminum Late 2008 and Early 2009 or later)
MacBook Air (Late 2008 or later)
MacBook Pro (Mid 2007 or later)
Mac Mini (Early 2009 or later)
Mac Pro (Early 2008 or later)
Xserve (Early 2009)
The OS X Mavericks 10.9.5 update is recommended for all Mavericks users. It improves the stability, compatibility, and security of your Mac.
This update includes:
• Improves the reliability of VPN connections that use USB smart cards for authentication • Improves the reliability of accessing files located on an SMB server • Includes Safari 7.0.6
