This update:

Improves 4K display support on Mac Pro (Late 2013) and MacBook Pro with 15-inch Retina Display (Late 2013)
Adds the ability to sync contacts and calendars between a Mac and iOS device using a USB connection           
Improves the reliability of VPN connections using IPsec
Includes Safari 7.0.3       

For detailed information about this update, please visit: About the OS X Mavericks 10.9.3 Update
For detailed information about the security content of this update, please visit:

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