Consider the following scenario:

• You run the release version of Windows Vista in Workgroup mode.
• You install Windows Vista Service Pack 1 (SP1).
• You uninstall Windows Vista SP1.
• You run Windows Vista in Workgroup mode again.

In this scenario, the Microsoft Message Queuing (also known as MSMQ) service does not start. Additionally, an event is logged to indicate that the notify_queue$ queue is not found.

When you try to send messages to the HTTP address or to the multicast address of a Microsoft Message Queuing queue on a computer that is running a 64-bit version of Windows Vista, the attempt is unsuccessful. Additionally, you receive the following error message:

404 not found

After you use the “Turn Windows features on or off” wizard in Windows Vista to configure Windows features, no Microsoft Message Queuing 4.0 components are enabled when the wizard is finished.

Note: Microsoft Message Queuing is also known as MSMQ.

Consider the following scenario:

• You send a message to a local transactional queue in Microsoft Message Queuing, also known as MSMQ, 4.0.
• You set the AcknowledgeType property to System.Messaging.AcknowledgeTypes.NegativeReceive for the message that you are sending.
• You specify a value for the AdministrationQueue property of the message.
• You specify a value for the DeadLetterQueueName property of the message.
• A negative acknowledgement is generated for the message that you are sending.

In this scenario, the sent message is written to the specified dead letter queue. However, a negative acknowledgement is not sent to the specified administration queue.