Improvements of Reliability differ from PC to PC based on hardware, environment, and usage. Customers will experience varying levels of benefit.

• SP1 addresses issues many of the most common causes of crashes and hangs in Windows Vista, as reported by Windows Error Reporting. These include issues relating to Windows Calendar, Windows Media Player, and a number of drivers included with Windows Vista.

• Improves reliability by preventing data-loss while ejecting NTFS-formatted removable-media.

• Improves reliability of IPSec connections over IPv6 helping ensure that all Neighbor Discovery RFC traffic is IPsec exempted.

• Improves certain problem scenarios where a driver goes to sleep with incomplete packet transmissions by helping ensure the driver is given enough time to transmit or discard any outstanding packets before going to sleep.

• Improves wireless ad-hoc connection (computer-to-computer wireless connections) success rate

• Improves the success of peer-to-peer connections, such as Windows Meeting Space or Remote Assistance applications, when both PCs are behind symmetric firewalls.

• Improves Windows Vista’s built-in file backup solution to include EFS encrypted files in the backup.

• Users who did not opt-in to the Customer Experience Improvement Program (CEIP) will be prompted again to join after installing SP1. The experience will remain the same and the default will continue to be opt-out.