I would like to setup a secondary exchange 2010 server for redudancy. They are shutting off the power for our corporate office (where our single install of exchange is installed) for a day and I want to be able to setup a secondary server offsite to handle delivering our mail during the outage. I would like to be able to use this server in the future as a fail safe for mail. What is the best way to go about doing this? Are there 3rd party apps or solutions for this kind of thing?