Share Outlook 2007 Main Contacts Folder through Exchange Server
 

We have a small group of 4 who are using a hosted 2007 Exchange Server
through 123together.com for Outlook 2007. We are looking for a way to share
our main contacts folder. We all also use our mobile phones to access our
main contacts folder (so delegates don't help us).

We have found a handful of Solutions for Outlook 2003 and before, but
nothing for 2007 yet.

We also can't add programs to the Server, so this would have to be something
we added to our individual computers.

We would also consider storing our Contacts somewhere online if we could
then each sync or main contacts folder with the online group of contacts.

Any ideas?