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Thanks for your help guys, and speed.
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I have set up my exchange server to push email to mobile clients, to do this I have opened port 80 on the firewall pointing to the exchange server, I have locked down ISS to only allow IP's from the mobile range.<br />
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Is there anything else I can do to improve the security?<br />
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I value the need for good security so I have awarded high points
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I have set up my exchange server to push email to mobile clients, to do this I have opened port 80 on the firewall pointing to the exchange server, I have locked down ISS to only allow IP's from the mobile range.

Is there anything else I can do to improve the security?

I value the need for good security so I have awarded high points

security for Exchange push email

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.

Windows OS

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Operating system security (OS security) is the process of ensuring OS integrity, confidentiality and availability. OS security refers to specified steps or measures used to protect the OS from threats, viruses, worms, malware or remote hacker intrusions. OS security encompasses all preventive-control techniques, which safeguard any computer assets capable of being stolen, edited or deleted if OS security is compromised, including authentication, passwords and threats to systems and programs.