The 10.7.3 update is recommended for all OS X Lion users and includes general operating system fixes that improve the stability, compatibility, and security of your Mac including fixes that:
Add Catalan, Croatian, Greek, Hebrew, Romanian, Slovak, Thai, and Ukrainian language support
Address issues when using smart cards to log into OS X
Resolve issues authenticating with directory services
Address compatibility issues with Windows file sharing
For detailed information on this update, please visit this website: http://support.apple.com/kb/HT5048.
For information on the security content of this update, please visit: http://support.apple.com/kb/HT1222.

Posted in Lion, Mac OS X