You're using Forefront on Server 2003 or you have a headend appliance?
What 4G card are you using with the 728? Best check it is in the HCL
How are you finding PPTP on the 728?
EAS working ok for calendar, contacts and tasks?
The smartcard was never implemented by HP. There was an SDK sample and I seem to recall that there was one company that did something with it, however CE 3.0 itself - at least in the ROM implementation - cannot do anything with it.
CE 3 has no primary tools for manipulating the PKI. Later CE .net versions had a control panel applet for it. So you have to manipulate the certificate stores using API.