CalDav - What phone?
We use Zimbra Open edition. A number of user's have I-Phones or I-Pods. Using i-Cal these devices can alert users to upcoming meetings etc if they are away from their desks. In the UK the latest i-pod is about £180 (you can't get the last generation units any more so there has been a price hike). It seems like a bit much for something my old Palm Pilot did for a fraction of the cost (many years ago - OK it was before Wi-Fi)
I am looking for a Wi-Fi enabled device that would serve as a meeting pager. A Wi-Fi phone with Symbian or Android Pad would seem to be the answer. Some of the Nokia Wi-Fi phones look like they would be OK but no-one seems to be able to confirm i-Cal or CalDAv support. Android seems to be firmly tethered to G-Mail for its Calendaring or too pricy (see the Dell and Samsung devices).
Using z-push you can bring ActiveSync synchronisation to ZCS OSE and use it with many additional devices.
This might be another way to achieve your goal.
Z-Push looks interesting, but: Sun donated i-Cal code to Symbian. Is there a device out there that this has finally found it's way into? For preference I would like native support for a direct connection.
I will however look at open-sync, Thanks
For example the Ericsson Elm is available for about £100. It has Wi-Fi and an i-sync plug in but no ware does it tell you if this is calDav over the air or talking to i-tunes while docked to a PC