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What's New

The following table identifies what is new for each release of Background Intelligent Transfer Service (BITS).

VersionDescription of features
Version 5.0

New features:

BITS version 5.0 is included in the Windows Server 2012 and Windows 8 operating systems.

Version 4.0

New features:

  • Peer caching now uses Windows BranchCache. This new peer caching model replaces the model used for BITS version 3.0. For more information, see Peer Caching.
  • Added a more flexible resource access model that allows applications to associate a pair of security tokens to a BITS transfer job. For more information, see Helper tokens for BITS transfer jobs.
  • Added the BITS Compact Server, which is a stand-alone HTTP/HTTPS file server that provides the ability to transfer a limited number of large files asynchronously between computers.
  • Added more granular bandwidth throttling. For more information, see Group Policies.

BITS version 4.0 is included in the Windows Server 2008 R2 and Windows 7 operating systems.

You can also download BITS 4.0 for Windows Server 2008 with Service Pack 2 (SP2), Windows Vista with Service Pack 1 (SP1), and Windows Vista with Service Pack 2 (SP2). For information about downloading BITS 4.0, see KB968929.

The version of %windir%\System32\QMgr.dll is "7.5.xxxx.xxxx".

Version 3.0

New features:

  • Added Peer Caching which lets you download content from peers and also serve content to peers in a domain network.
  • Added notification for when a file is downloaded.
  • Added access to the temporary file while the download is in progress.
  • Added the ability to control HTTP redirects.
  • Added more group policies to control peer caching and limit download times.
  • Added diagnostic and troubleshooting events to the system event log.
  • Added support for User Account Control (UAC).

Note  BITS now uses group policies to limit the number of jobs and files you can create. This might affect applications that currently create a large number of jobs or add a large number of files to a job.

BITS version 3.0 is included in the Windows Server 2008 and Windows Vista operating systems.

The version of %windir%\System32\QMgr.dll is "7.0.xxxx.xxxx".

Version 2.5

Added support for custom HTTP headers, certificate-based client authentication for secure HTTP transports, and IPv6. Also added the use of Internet gateway device (IGD) counters to more accurately calculate available bandwidth.

The BITS 2.5 features are available in the Windows Server 2008, Windows Vista, and Windows XP with Service Pack 3 (SP3) operating systems.

You can also download BITS 2.5 for Windows Server 2003 with Service Pack 2 (SP2), Windows Server 2003 with Service Pack 1 (SP1), and Windows XP with Service Pack 2 (SP2). To download BITS 2.5, go to the Microsoft Download Center and install KB923845.

The version of %windir%\System32\QMgr.dll is "6.7.xxxx.xxxx".

Version 2.0

Added support for performing concurrent foreground downloads, using Server Message Block (SMB) paths for remote names, downloading ranges of a file, changing the prefix or complete name of a remote name, and limiting client bandwidth usage.

BITS version 2.0 is included in Windows XP with SP2 and Windows Server 2003 with SP1. You can also download BITS 2.0 for Windows Server 2003, and Windows XP. To download BITS 2.0, go to the Microsoft Download Center and install KB842773.

The version of %windir%\System32\QMgr.dll is "6.6.xxxx.xxxx".

Version 1.5

Added upload and upload-reply capability, command-line execution for events, and explicit credentials.

BITS version 1.5 is included in Windows Server 2003. A redistributable is available for Windows XP from the Microsoft Download Center.

The version of %windir%\System32\QMgr.dll is "6.5.xxxx.xxxx".

Version 1.2

Same functionality as version 1.0. Contains internal upgrades and improvements.

BITS version 1.2 is included in Windows XP with Service Pack 1 (SP1).

The version of %windir%\System32\QMgr.dll is "6.2.xxxx.xxxx".

Version 1.0

Initial release. Provides prioritized, throttled, and asynchronous downloads in the background or foreground. The downloads automatically resume after computer restarts and network disconnects.

BITS version 1.0 is included in Windows XP.

The version of %windir%\System32\QMgr.dll is "6.0.xxxx.xxxx".


Version 5.0

The following interfaces were added for this version:

Version 4.0

The following interfaces were added for this version:

Version 3.0

The following interfaces were added for this version:

The following constants were added to use with the IBackgroundCopyJobHttpOptions::SetSecurityFlags method:


Version 2.5

The following interface and enumeration were added for version 2.5:

Version 2.0

The following interfaces, structure, and topics were added for version 2.0:

For information about concurrent foreground downloads, see the Remarks section for BG_JOB_PRIORITY.

For information about using the SMB protocol, see BG_FILE_INFO.

Version 1.5

The following interfaces and topics were added for version 1.5:



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