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Licensing considerations

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Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

Licensing considerations

Message Queuing counts Windows Server 2003 family client access licenses (CALs). If no CALs are available, Message Queuing applications can fail to send messages and to open all queues. Message Queuing enforces the following rules for counting CALs:

  • An independent client running on Windows XP Professional can have no more than 10 concurrent Message Queuing sessions and remote-read sessions with other independent clients running on Windows XP Professional.

  • A dependent client does not count CALs, but its supporting server counts any sessions or queues opened on behalf of the dependent client. All Message Queuing sessions, remote-read sessions, and queues opened by dependent clients are counted. The number of dependent clients that can be supported is limited by the number of server CALs on the server.

  • All sessions used by a Message Queuing computer are counted only once.

For more information on licensing for Windows Server 2003 family operating systems, see Licensing, in the Windows Help file.