ISA for Publishing IIS & Exchange: Is it really necessary?

5 pts.
Tags:
Exchange Server
Firewall security
IIS
ISA Server
published applications
I was wondering: I am building a small network with three servers for a small office: 1) DC/DNS/DHCP/File Server 2) Exchange Server 3) IIS/FTP/Application Server These servers are going to access the internet via PAT (port forwarding on an ADSL router sharing one static public IP to the internal private network). A hardware firewall like ASA is out of the question. So i was wondering: is PAT secure enough. I know that ISA does application firewalling and packet inspection but is it really necessary to invest to another server and the required licenses? Why should i do so?

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