Check it out. Link to full review is included in the post.
Excellent administration console with plenty of wizards means no-hassle, task-based firewall management. Works well protecting Microsoft Exchange traffic. Improved monitoring and reporting.
Best value realized for shops already running Windows infrastructure.
A compelling software-based firewall with strong administrative flexibility for most any network running Windows. It can dig in and examine traffic that connects to Exchange (and other Windows servers) for very deep security.”
[Via MS Exchange Blog ]