Team Folders in Outlook 2000 without a W

I have to figure a way to make Outlook Team Folders available for my company throughout about 50 remote US locations where we do not have WAN links. I have Exchange 5.5 running as a mail server at the main site and remote users hitting the server through OWA and Outlook 2000 through their ISP. How can I use Team folders to colaberate without going to expense of setting up WAN links or dial up connections? Note OWA 5.5 does not support Team Folders and I cannot upgrade to Exchange 2000 at this time. thanks for your help Dennis Malone MCSE/MCT/MCP+I