After you upgrade a computer from Windows XP to Windows Vista, you cannot send or receive encrypted Microsoft Message Queuing, also known as MSMQ, 4.0 messages. The attempts to send or to receive encrypted Message Queuing messages fail. Additionally, you receive the following error message:

0×80090016 “The key container could not be opened”.

Microsoft Message Queuing: A messaging protocol that allows applications running on disparate servers to communicate in a failsafe manner.

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.