Summary: Invite external users from iCal gives error Status: New CreatedBy: Andrew McMillan AssignedTo: Inserted: 2010-12-29T23:38:10 Updated: 2010-12-29T23:38:10 Here what I've found on the logs when try to add a not davical user, with version 0.9.9.4: :***************** Response Header **************** headers:-->X-Powered-By: PHP/5.2.5 headers:-->Server: 0.9 headers:-->DAV: 1, 2, 3, access-control, calendar-access, calendar-schedule headers:-->DAV: extended-mkcol, calendar-proxy, bind headers:-->ETag: "2969f85aaf1bd94c74929d57a8629703" headers:-->X-DAViCal-Version: DAViCal/0.9.9; DB/1.2.9 headers:-->Content-type: text/xml; charset="utf-8" :******************** Response ******************** response:--> response:--> response:--> response:--> response:--> mailto:joe.user@gmail.com response:--> response:--> 3.7;Invalid Calendar User response:--> response:--> response:--> response:--> and then iCal reports an error 403.