Windows Search 4.0 released!

This release focuses on performance and reliability improvements.  Here are some highlights:

• Faster queries, often several times faster
• Faster indexing / reduced resource usage
• Support for EFS (encrypted folders)
• Support for indexing delegate mailboxes
• Fixes for all the top reported Watson crashes / errors
• New group policy options

This release also adds the following Vista / Server 2008 features to Windows XP / Server 2003 systems:

• Remote query support (using the server’s indexed when querying a network share)
• Support for Vista-style preview handlers (Office 2007 documents, etc)

Read the KB article here for more details and complete feature list

BTW: Installing this will force a reboot.