I am after some opinions on the best way to set up the following scenario. Currently my organisation has 7 different office sites throughout the state. At the moment each site has it's own individual domain servers and email is looked after individually at each site. We want to move to a scenario that all sites are connected to servers at the one central location. I am wondering if a VPN scenario is the best scenario or should I be looking at a private WAN set up by our service provider.
Whatever way it is done I would want one set of servers at our head office for domain, exchange and anything else.
Can anyone provide me with information or point me in the right direction to figure out how to set this up and also any actual hardware recommendations.
Many thanks in advance