I am in searching of the benefits of upgrading my current Exchange 2000 system to 2007. The main challenge of using Exchange 2000 & Outlook is that when the user is on remote, Outlook does not work well with VPN, mostly due to the lousy local network connection such as hotel wireless; however, Outlook Web Access (OWA) seems to be working at acceptable level. For example, when I traveled to the far east, it's impossible to use VPN because of the poor inter-continental connection. I got by with using OWA.
My question is can I use Outlook but set it up to use HTTP or Port 80 with all the Exchange benefits? I do know the OWA in 2007 is nice.
On top of this, why do I need to upgrade to 2007?