Mac OS X 10.6.7 Update for iMac (early 2011) 1.0
System Requirements:
Mac OS X 10.6.7
File Size: 382.56 MB
The Mac OS X 10.6.7 Update for iMac is recommended for all early 2011 iMac models. It includes general operating system fixes for Mac OS X Snow Leopard that enhance the stability, compatibility, performance, and security of your Mac, including fixes that:
Improve the reliability of Back to My Mac
Resolve an issue when transferring files to certain SMB servers
Address various minor Mac App Store bugs
Address minor FaceTime performance issues
Address issues with graphics stability and 3D performance
Improve external display compatibility
Improve Thunderbolt device support
See this article on how to verify the authenticity of this update.
For information on the security content of this update, please visit: http://support.apple.com/kb/HT1222