We are planning an HA/DR solution. Currently, all our servers are in one central office. We have 3 small remote offices. Our plan is to use a co-lo to place our Front Edge Exchange 07 server and would also like a proxy server for web traffic. Our HA/DR site will be one of our remote offices. The plan is for external clients (for web access) and remote users (for OWA and activesync) to hit the co-lo and then the proxy would redirect to our main corp location. We will replicate all our servers to the HA site using DoubleTake into VM's. Does anyone have any recommendations? Also, I need a good corp level proxy server for the co-lo. Suggestions?