This is a list of features (specs and extensions) per CalDAV/CardDAV servers that I tested over the years.
The calendar-schedule spec was a RFC draft, and it was modified to become RFC 6638 (calendar-auto-schedule).
calendar-access is the main spec (RFC 4791), a CalDAV server can't say it's a CalDAV server if it's not implementing that RFC.
| calendar-access | calendar-schedule | calendar-auto-schedule | calendar-availability | inbox-availability | calendar-proxy | calendarserver-private-events | calendarserver-private-comments | calendarserver-sharing | calendarserver-sharing-no-scheduling | calendar-query-extended | calendar-default-alarms | addressbook | calendarserver-principal-property-search | caldav-attachments | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bedework (3.7) | X | X | X | ||||||||||||
| CalendarServer (trunk) | X | X | X | X | X | X | X | X | X | X | X | X | X | X | |
| DAViCal (0.9.9) | X | X | X | X | X | ||||||||||
| iCal Server (10.5) | X | X | X | X | X | X | |||||||||
| iCal Server (10.6) | X | X | X | X | X | X | X | X | |||||||
| iCal Server (10.7) | X | X | X | X | X | X | X | X | X | X | X | X | X | ||
| iCal Server (10.8) | X | X | X | X | X | X | X | X | X | X | X | X | X | X | |
| CommuniGate Pro (5.3) | X | X | X | X | |||||||||||
| CommuniGate Pro (5.4) | X | X | X | X | X | ||||||||||
| CommuniGate Pro (6.0) | X | X | X | X | X | X | |||||||||
| Kerio Connect (6.7 -> 7.1) | X | X | X | X | X | ||||||||||
| Kerio Connect (7.2/7.3) | X | X | X | X | X | X | X | ||||||||
| Zimbra (7.0.1) | X | X | |||||||||||||
| Google Calendar | X | X | X | ||||||||||||
| IceWarp Server (10.3.4) | X | X | X | X | X | ||||||||||
| Oracle Calendar Server | X | X | X | X | X | X | X | ||||||||
| Atmail | X | X | X | ||||||||||||
| X | X | X | X | X | |||||||||||
| X | X | X | X | X |
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