I am in charge of a network where we are running Win2k3 SBS SP1. The server is running exchange, MS SQL and ISA.The configuration I would like to have is when one server goes down, the other can take over. The SBS is the PDC and is the only one we have.There is a second one which has been bought for me to implement this redundancyI have several questions1. Is this configuration possibe in the first place?2. Is it possible to have 2 servers in the same domain both running exchange and each mail sent/received can be found on any of the servers at any time?3. What software/hardware can facilitate this?Pls advise.