There is an Exchange question or a customer request The customer has Exchange server 2003 standard edition on windows server 2003 and he wants GM or an administrator to monitor all users' mailboxes through receiving all incoming and outgoing e-mails and monitoring them through specific Mailboxes So, is current customer environment could support this or which version and edition of Exchange server that has the Monitoring functionality Thanks

You can go for journaling and it is the best way for regulatory compliance in Exchange. It is okay with standard edition but requires minimum SP1 Here is the document for that: Journaling with Exchange Server