The maximum length of a message queue label is 124 characters.
The Label property does not need to be unique across all queues. However, if multiple queues share the same Label, you cannot use the Send(Object) method to broadcast a message to all of them. If you use the label syntax for the Path property when you send the message, an exception will be thrown if the Label is not unique.
The following table shows whether this property is available in various Workgroup modes.