I have three locations that are currently running two domains and a workgroup. I want to consolidate some of this by putting a 2007 Exchange Server in a Colocation and have all three sites access email via RPC over HTTP.
Then I want to setup VPN's to connect all three sites. My question is, if I put three "File" servers at all three sites, how can I set it up so that they all can authenticate with each other. I would like for all three sites to be able to login, even if one server is down. I also would like for them to share data so that if one server dies the other two have that data...if possible.