View mailbox usage information
- Open Server Management. To open Server Management, click Start, and then click Server Management.
- In the console tree, double-click Advanced Management, and then double-click the name of your Exchange domain.
- Double-click Servers, double-click your server name, and then double-click First Storage Group.
- Double-click Mailbox Store, and then click Mailboxes.
The details pane lists all mailboxes in use on the server and contains information about mailbox usage.
If you manually set up the computer running Exchange Server 2003, you might need to double-click Routing Group and First Routing Group before Servers (in step 3) is visible.