security for Exchange push email

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
jacassAsked:
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Matthew MillersCommented:
Here is a good article for securing client access on exchange 2003.
http://technet.microsoft.com/en-us/library/aa995729(EXCHG.65).aspx

I would first start by getting a certificate and enabling SSL.
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Redwulf__53Commented:
Definately certificate+SSL.
Additionaly you should define a more restrictive Exchanger Activesync policy in Exchange management console (require device password!) and assign this policy to all users, and disable Activesync functionality for all users that don't need it.
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jacassAuthor Commented:
Thanks for your help guys, and speed.
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