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This artricle is based on the TechNet article of the same name, last updated March 2009:

Applies To: Windows Server 2008 R2
Current Version: 2.5
An update package for BITS is now available for Microsoft Windows Server 2003 and for Microsoft Windows XP. This update is a required component for Microsoft System Center Configuration Manager 2007 and for Microsoft Security Essentials. The new features of BITS 2.5 help improve security. If you use BITS to transfer data, the new features also improve flexibility.


The Background Intelligent Transfer Service (BITS) has two role services: the Compact Server and the IIS Server Extension. The Compact Server is a stand-alone HTTP or HTTPS file server, whereas the IIS Server Extension is an Internet Information Services (IIS) plug-in that requires a server running IIS.

IIS Server Extension

The BITS IIS Server Extension lets you configure a server that is running IIS to allow BITS clients to perform background, resumable file uploads to IIS virtual directories. On completion of a file upload, the BITS Server can notify a Web application of the newly uploaded file. This allows the application to process the uploaded file. The Web application can then optionally reply to the client responsible for the upload.

Compact Server

The BITS Compact Server is a stand-alone HTTP or HTTPS file server, which allows applications to host files for BITS clients to download, and allows the asynchronous transfer of a limited number of large files between computers.

Additional resources

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