Based on
[CalendarServer-users] delegation help? and
Nabble - Calendar Server - Users - attendee lookup and
AFP548 - Record Augmentation - Part 1 - The Cylinder of Destiny and
/CalendarServer/trunk/doc/ical-schema.txt ? CalendarServer ? Trac it should be possible to have iCal autocomplete addresses in the Zimbra GAL. You shouldn't even need to extend the LDAP schema; variable interpolation of the uid attribute should work. I'm not getting very far without a live example of the appropriate servicelocator attributes, though. Has anyone else gotten further down this road?