Windows Desktop Search 3.X SDK is released
Windows Search is a standard component of Microsoft Windows Vista enabled by default and an add-in for Windows XP which allows instant search capabilities for most common file and data types such as e-mail, contacts, calendar appointments, documents, photos, multimedia, and other formats extended by third-parties. These capabilities enable consumers and Information Workers to more efficiently find, manage, and organize the increasing amount of data common in home and enterprise environments.
The content indexed is based on the file and data types supported through add-ins included with Windows Search and the default inclusion and exclusion rules for folders in the file system. For example, the filters included in Window Search support over 200 common types of data including support for Microsoft Office documents, Outlook e-mail (in conjunction with the MAPI protocol handler), plain-text files, HTML, and many more. For a full list of file types natively supported, refer to What is Included in the Index.
Read full article on MSDN: https://msdn2.microsoft.com/en-us/library/aa965362.aspx