when Message Queuing initializes. Port 135 is queried to discover the 2xxx ports. Version references Version 1.0 (May 1997). Supports Windows 95, Windows NT 4.0 SP3, Windows 98 and Windows Me. Version 2.0, included with Windows 2000. New features include: Support for registering public message queues in Active Directory, 128-bit encryption and digital certificate support, full COM support for message properties (achieving functional parity with the Win32 API function calls, full DNS path name support, improved performance in multi-threaded applications. Version 3.0, included with Windows XP (Professional, not Home Edition) and Windows Server 2003. New features include: Internet Messaging (referencing queues via HTTP, SOAP-formatted messages, MSMQ support for Internet Information Services), queue aliases, multicasting of messages, and additional support for programmatic maintenance and administration of queues and MSMQ itself. Version 4.0, part of Windows Vista and Windows Server 2008. New features include: Subqueues, improved support for "poison messages" (messages which continually fail to be processed correctly by the receiver), and support for transactional receives of messages from a remote queue. Version 5.0, part of Windows 7 and Windows Server 2008 R2. New features include: support for Secure Hash Algorithm 2.0 (SHA2) and all advanced hash algorithms that are supported in Windows 2008 R2; by default, weaker hash algorithms are disabled. Version 6.0, part of Windows 8 and Windows Server 2012. Version 6.3, part of Windows 8.1 and Windows Server 2012 R2. Uses MSMQ is heavily used in various Windows Platform-based contact center applications which uses this service for internal notifications and services. See also List of Microsoft Windows components Java Message Service, similar technology on the Java platform Amazon Simple Queue Service, commoditized messaging service provided by Amazon.com for a per-use fee. It allows users to rent access to messaging without having to maintain their own server. RabbitMQ, open source message queue broker that implements a pre-standard version of AMQP. References External links MSDN documentation Message Queuing Message-oriented middleware Message Queuing Enterprise application integration