I've done a bit of research and found nothing really interesting about using PKI with ZCS (and ZCO) : bugs are assigned but no real information in them.
I know there are people using PKI with ZCS arround here.
I guess they're using CAS/Preauth to handle the certificates (not ZWC itself) but I wonder if there's a way to get this work both with ZWC and ZCO.
Is anyone doing preauth (and/or stg similar) with ZCO/Outlook users ?
The ZCO seems to be tight to user/password login on the ZCS, is there any way to use a different way to authenticate ?