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We are experiencing the same issue with email forwarding (1500 Android Phones all using HTC Mail with Zimbra EAS). More details are located at the following page. Be sure to put in your vote. There is a commitment for Helix but doesn't guarantee that it will be fixed. Since it works with Exchange 2007, I know a server side fix is possible. So I am crossing my fingers at this point.
Yeah, a server side fix is definitely possible. I have a test setup running Zimbra (6.0.10) and a third party ActiveSync solution. With this setup I have HTML capabilities and can forward mail inline using the HTC mail app. The Zimbra team should be able to do this as well.