I’ve used turning on auditing for successful logins (this will make the log file grow quickly depending on how many users you have) and then filter the log viewer for what you’re looking for. I went direct from 2000 to 2007 so I’m not sure what the steps are in 2003 but you should be able to do the same thing. Here’s a link to a good page on the subject for 2003 - http://www.msexchange.org/tutorials/Importance-Auditing-Exchange-2003-Servers.html .
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