Hi Paul, sorry for the delay. I didn't set up vpn, unless it does it behind the scenes. We went into the accounts and added a corporate email account. This asked for configuration information like username, password, exchange server (which is our owa server), etc. One the configuration information was entered, it started syncing the email. Going back into accounts, I turned on sync of calendar and contacts.
But in general, I do not think this is going through VPN at all. It is going through our exchange server / Outlook web access server, that is exposed outside the firewall.
Robert