The Message Queuing Triggers (MSMQTriggers) service provides a rule-based system to monitor messages that arrive in a Message Queuing service queue. The Message Queuing Triggers service enables the invocation of a Component Object Model (COM) component or an executable, depending on the queue's defined filters for the incoming messages.

The Message Queuing Triggers service is installed as part of the Message Queuing service on Windows Server 2008 R2. In Windows 7, the Message Queuing Triggers feature must be installed through the Turn Windows Features on or off dialog box in the Programs area of Control Panel.

If the Message Queuing Triggers service stops, you cannot apply rule-based monitoring or invoke programs to process messages automatically.