My firm has 150 employees which I need to give access to email via OWA.
I am currently running 1 x Exchange 2003 Standard Server (backend server).
I have purchased a pc with a quad core processor and 4gb of ram to serve as my frontend server.
I want to also put in an ISA server for security as we are an investment firm dealing with highly confidential information.
What do I need to install on the frontend server so it can relay messages?
If an ISA server is in place do I still need to set up SSL encryption?
Will the ISA server have to be installed on the DMZ zone or internal network?
What else will be effected with an ISA server in place eg internet? As I understand the ISA server acts as a firewall which will open and close ports as and when needed.