One nice feature of the Outlook thick client is to view other user's calendars. In OWA 2003 it was a different URL that was needed, as along as you had the permissions.
Now with Exchange 2007 OWA the URL is different.
Below is the syntax - all on one line:
https://<server>/owa/<user@yourdomain>/?cmd=contents&module=calendar&view=weekly
replace <server> and <user@yoourdomain> with your host and User's email address as required