You and a lot of other people would like to do that.  The problem is that,
AFAIR, the activities are journal items, which are always stored in everyone's
personal mailbox.  You have to have permissions to go to everyone's mailbox
and look for the desired set of activities there, or change the activities
code to store the new activities in a public folder.  I did the latter a long,
long time ago in an earlier version of Outlook, which is now long gone.  But
you can reference the methodology from the original publication site.  Start
from the www.slipstick.com page to track it down:

http://www.slipstick.com/journal/pubjournal.htm#hdp

"Hollis D. Paul's method Reorganize the way mail flows in your organization so
that a shared mailbox is the primary delivery location, with private messages
being sent to secondary mailboxes. See Viewing Journal Items for MVP Hollis D.
Paul's description of how this might work."

Start from the root of the page to get the full discussion.

Viewing Journal Items

attached is a pst for the two forms that will allow workgroups to see all the
journal items made for a contact, not just the journal items of the current
user as they now have it.

http://www.outlookexchange.com/articles/home/outlookcodeexample.asp#35

Once upon a time I was referring to this as The Public Contacts/Public Journal
Project.  It's really what sales groups wanted, but they never wanted to pay
for a consultant to create their own forms.  Now they pay big bucks to
Microsoft for BCM.

Hollis D. Paul [MVP - Outlook]
Hollis@outhousebythesound.com
Mukilteo, WA  USA