Its a simple setup, first off download the app you can test it fully for 30 days to see if it works (you'll know if a few hours or days if it does) then you buy the license off of the market as well and its fully functional.
Its that simple, all you typically need is to get the webmail server for your exchange server and you can get it setup, if you don't know if your company uses exchange or whatever take it to your company IT dude.