Background Intelligent Transfer Service - Version History

Version History

  • Version 1.0 (October 2001)
    • Initial release. Included with Windows XP RTM.
  • Version 1.2 (July 2002)
    • Included with Windows XP Service Pack 1 and Windows 2000 Service Pack 3. BITS' inclusion with Windows 2000 brought Automatic Updates capabilities into the core of that operating system.
    • No other external changes were made.
  • Version 1.5 (September 2003)
    • Included with Windows Server 2003 and made available as a separate download for Windows 2000 and Windows XP.
    • Added upload and upload-reply capability, command-line execution for events, explicit credentials, and support for Windows 2000.
  • Version 2.0 (August 2004)
    • Included with Windows XP Service Pack 2 and Windows Server 2003 Service Pack 1, and made available as a separate download for Windows 2000 Service Packs 3 and 4, and prior releases of Windows XP and Server 2003.
    • Added support for performing concurrent foreground downloads, using Server Message Block paths for remote names, downloading portions of a file, changing the prefix or complete name of a remote name, and limiting client bandwidth usage.
    • BITS 2.0 is a minimum requirement for Windows Server Update Services.
  • Version 2.5 (June 2007)
    • Adds support for certificate-based client authentication for secure HTTP transports and custom HTTP headers.
    • Support for IPv6
    • Available for download for Windows XP and Windows Server 2003, and is included with Windows XP Service Pack 3.
  • Version 3.0 (November 2006)
    • Adds peer caching for domain-joined computers which allows computers in the same subnet to download content from peers and also serve content to peers, receive notification when a file is downloaded, access the temporary file while the download is in progress, and control HTTP redirects. BITS 3.0 also uses Internet Gateway Device counters to more accurately calculate available bandwidth.
    • Adds Group policies to control peer caching and limit download times, number of jobs and files download. BITS 3.0 also writes diagnostic and troubleshooting events to the system log which can be viewed in Event Viewer.
    • BITS 3.0 was introduced with Windows Vista, and is included in all later Windows versions. BITS 2.5 capabilities are also included in Windows Vista and Windows Server 2008.
  • Version 4.0 (July 2009)
    • Introduced with Windows 7 and Windows Server 2008 R2 and available for Windows Vista SP2 and Windows Server 2008 RTM
    • Adds a new resource access model that allows applications using BITS to assign two access tokens with different rights to do BITS transfer jobs.
    • For Windows Server, BITS 4.0 adds an HTTP-based file server called BITS compact server for computers in the same domain.
    • More granular bandwidth throttling group policies.
    • With BITS 4.0, the peer caching model is deprecated and replaced by BranchCache subnet-level peer caching.

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