64-bit versions of Windows XP with Service Pack 2 (SP2) or a later version.32-bit versions of Windows XP with Service Pack 2 (SP2) or a later version.64-bit versions of Windows Vista with SP1.32-bit versions of Windows Vista with Service Pack 1 (SP1).Windows Search 4.0 supports the following operating systems: When you install the Windows Search 4.0 packages, you also install the following items:

By default, this add-in is included for supported 32-bit operating systems. This add-in also lets Windows Search index shared items on remote networks. This add-in lets Windows Search index redirected My Documents folders. The Add-in for Files on Microsoft Networks for Windows XP and Windows Server 2003 packages. The Group Policy template (Search.adm or Search.admx /l) for managing Group Policy objects that span multiple versions of Windows Desktop Search and Windows Search. Windows Search 4.0 packages include the following: Prevent adding UNC locations to the index from Control Panel.Enable throttling for online mail indexing.Prevent adding user-specified locations to the All Locations menu.Allow for indexing of online delegate mailboxes.Prevent clients from querying the index remotely.Prevent automatically adding shared folders to the index.Prevent customizing indexed locations in Control Panel.Prevent adding Universal Naming Convention (UNC) locations to index from Control Panel.Support for the following new enterprise Group Policy objects:.Windows software updates for Watson errors.Faster previewer updates for Windows XP.Support forclient-to-client remote query to shared indexed locations.Support for indexing online delegate mailboxes.Reduced effect on Microsoft Exchange when you index e-mail in online mode, and there is no local cache (.ost).Support for indexing encrypted documents of local file systems.Windows Search 4.0 includes the following improvements: You can use this search engine to index a program's content and to obtain instant results when you search in a particular program. The search engine in Windows Search 4.0 is a Microsoft Windows service that is also used by programs such as Office Outlook 2007 and Office OneNote 2007. Windows Search 4.0 helps you find and preview documents, e-mail messages, music files, photos, and other items on the computer. Windows Search 4.0 lets you perform an instant search of your computer. To continue receiving security updates for Windows, make sure you're running Windows Vista with Service Pack 2 (SP2). Support for Windows Vista Service Pack 1 (SP1) ends on July 12, 2011.

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