In Microsoft Exchange Server 2003, queues are used to manage the flow of email messages. Checking queues can help administrators identify and resolve issues that may be preventing messages from being delivered.
There are several methods for checking queues in Exchange 2003, including using the Exchange Management Console (EMC), the Queue Viewer, and the Exchange Management Shell (EMS). The EMC is a graphical user interface (GUI) that provides a user-friendly way to manage Exchange servers and queues. The Queue Viewer is a command-line tool that provides more detailed information about queues than the EMC. The EMS is a command-line interface (CLI) that provides access to all of the Exchange management cmdlets.