I have a client that really cannot afford point-point T1 or an MPLS network as I would love for them to have, They have 4 offices around the country and currently don't have an AD Domain - all local administration. I am about to install their first Windows Server in the main office and would like to join the other offices to the domain. I want to propose that they use cable connections or FIOS for all their locations - instead of 1 T(main office) and the DSL connections (branch) they currently have - and then use their current firewalls (that do VPN for file sharing now) to connect back to the mail site for AD stuff. The branch office with the most users has maximum 6 PCs. Should this work and act nicely with AD?