Push mail doesn't work with HTC touch and exchange 2007

We have recently installed a new Exchange 2007 Server. All our iphones are connecting fine with the new Server, but none of our HTC's can seem to connect, with the error "the server you are trying to synchronize with is not an exchange server or is running incompatible software..."
Activesync is set up exactly as before, with email address, user name, password, domain and External IP address (outside edge of router. All port forwards are set-up as they were for our old 2003 Exchange Server.
We are not using an SSL, but don't need one for it to work anyway (as far as I'm aware).
Our old 2003 Exchange server worked fine.

Any ideas ???
sysintAsked:
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MikeGGGConnect With a Mentor Commented:
Please read this , here it is explained very well.
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sysintAuthor Commented:
your link seems to suggest that I must have an SSL for this to work, and yet, our iphones connect immediately, and download mail etc without a cert in place. It seems that the HTC isn't even getting near the server for some reason.
can you confirm that I DEFINITELY will need an SSL?

Many thanks.
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MesthaConnect With a Mentor Commented:
It isn't a hard requirement to have SSL, but I wouldn't dream of running ActiveSync without it. Without SSL that means your usernames and passwords are going across the internet in the clear, at frequent intervals. Not exactly secure.

Can the devices browse the server from Pocket IE?

Simon.
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sysintAuthor Commented:
The information was good, but was not the final solution.
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