Sorry about that - not sure what happened.
I have had no problem setting up ActiveSync with SBS (apart from having to export the self signed cert from i.e. on the server rather than rely upon the one in store - even tho the one in store works OK with laptop and other clients). However when it comes to browsing to the /remote site using the Treo I get connection lost (with or without SSL enabled on the virtual site). The laptop has no problems from the WAN nor the clients from the LAN.
I'm using an IP address, not a fully qualified host name. I've have yet to delve into the Treo's logging - if I can find it.
I've got a feeling I've seen something on this but can't locate it. So is this something known before I spend more time on the problem?