Make sure you have SP2 as well as there are some new auditing features.
Understanding Mailbox Access Auditing with Exchange Server 2007 Service Pack 2
Maybe this is right in front of me, but can’t find it… anyway, in Exchange 2003 you could look at the mailbox store and see a last logon of each user on the mailbox and make a good estimate of which users were using their mailbox and whether it was by OWA or Outlook…
Is there a way to glean this info from Exchange 2007, and if so, how?
Lee Ann Swanson
Connecting Point Computer