There are those who are so far into Microsoft that they will will deploy Windows ISA instead of a decent product such as Raptor, Sidewinder or IOS/PIX Firewall. For the Microsoft places I've worked, for the most part they don't use ISA because the old-time networking guys refused to use Microsoft to run their network infrastructure while the rest of the Microsoftie crowd complained.
So you just proved my point. The suits really do know what they are doing.