OS X 10.9.3


 * 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