GW 8.0.2HP2 Agents on Windows 2008 servers

Is there a way to determine the number of internal messages sent during a given time? Boss wants to know how many internal messages were sent during July of this year.

We have 4 domains, 6 post offices, 2 gateways:

1 - primary domain for admin stuff, LDAP, eDir, etc.
1 - secondary domain for user post offices
6 - user post offices
1 - secondary domain for GWIA
1 - GWIA
1 - secondary domain for WebAccess
1 - WebAccess

Thanks for any info on this.