If you have have Office 2007 or a Windows Vista or Windows Desktop Search (WDS) then you probably have V2.6 or V3 of this fantastic search product.  Version 4 has a wealth of updates, but most importantly, is more stable and faster.  One of the things I love about this is that if you put this on a client and server, and then search a network share, if the contents are indexed on the server then WDS uses the remote index to search, making it super fast.  It can even be used with SBS 2003 / 2008 to speed up access to the shares there too.

Description of Windows Search 4.0 and the Multilingual User Interface Pack for Windows Search 4.0

Windows Search 4.0

Windows Search 4.0 lets you perform an instant search of your computer. Windows Search 4.0 helps you find and preview documents, e-mail messages, music files, photos, and other items on the computer.
The search engine in Windows Search 4.0 is a Microsoft Windows service that is also used by programs such as Microsoft Office Outlook 2007 and Microsoft Office OneNote 2007. You can use this search engine to index a program's content and to obtain instant results when you search in a particular program.
Windows Search 4.0 includes the following improvements:

• Support for indexing encrypted documents of local file systems
• Reduced affect on Microsoft Exchange when you index e-mail in online mode, and there is no local cache (.ost)
• Support for indexing online delegate mailboxes
• Support for client-to-client remote query to shared indexed locations
• Improved indexing performance
• Faster previewer updates for Windows XP
• Per-user Group Policy settings
• Windows software updates for Watson errors
• Support for the following new enterprise Group Policy objects:

Computer policies

• Prevent adding Universal Naming Convention (UNC) locations to index from Control Panel
• Prevent customizing indexed locations in Control Panel
• Prevent automatically adding shared folders to the index
• Allow for indexing of encrypted files
• Disable indexer back-off
• Prevent clients from querying the index remotely
• Allow for indexing of online delegate mailboxes
• Prevent adding user
• Specified locations to the All Locations menu
• Enable throttling for online mail indexing

Per-user policies

• Prevent adding UNC locations to the index from Control Panel
• Prevent customizing indexed locations in Control Panel
• Prevent indexing certain paths
• Default indexed paths
• Default excluded paths

Windows Search 4.0 Administrator's Guide
http://technet2.microsoft.com/windowsserver2008/en/library/f98696ed-6e3e-47b7-ab38-511439bce7ae1033.mspx?mfr=true
Windows Search 4.0 Troubleshooting Guide
http://technet2.microsoft.com/windowsserver2008/en/library/84c1c305-baaa-4352-b55a-45daaebf18df1033.mspx?mfr=true 

The following files are available for download from the Microsoft Download Center:

• Download the 32-bit Windows Vista and Windows Server 2008 package now.
• Download the 64-bit Windows Vista and Windows Server 2008 package now.
• Download the 32-bit Windows XP package now.
• Download the x64-based Windows XP package now.
• Download the 32-bit Windows Server 2003 and Windows Home Server package now.
• Download the x64-based Windows Server 2003 package now.

ttfn

David