Microwave transmission, point-to-point

I have a school project in which a fairly large company is moving to Atlanta,
Georgia. The proposed campus has 3 buildings situated 5 miles apart from each
other. I am looking into the cost and feasibility of using point-to-point
microwave transmission can achieve up to 54Mbs transmission rates instead of a
leased line T-3 which supposedly reaches 44.7Mbs transmission rates. Does
anyone have any experience with this type of transport media and can you
provide any ballpark cost ideas on the equipment cost for a single point
-to-point microwave connection?

Please advise.