OS X 10.9.3 was an update for OS X 10.9 (Mavericks) that was released by Apple on May 15, 2014.
- Improves 4K display support on Mac Pro (Late 2013) and MacBook Pro with 15-inch Retina Display (Late 2013)
- Reinstates the ability to sync contacts and calendars between a Mac and iOS device using a USB connection, lost with 10.9.0.
- Improves the reliability of VPN connections using IPsec
- Resolves an issue that prevented Font Book from installing PostScript Type 1 fonts
- Improves reliability of copying, editing and inspecting permissions of files on an SMB file server
- Improves reliability of network home directories
- Improves stability when installing configuration profiles
- Improves login speed for users in Active Directory groups
- Includes Safari 7.0.3