How to add a Zimbra mail server Calendar to an iPhone

Users of the OpenSource edition of Zimbra can add their Zimbra Calendar to an iPhone by configuring the phone as described below.

1. Go to the system setting menu and select Mail, Contacts, Calendars.
2. Press Add Account, choose Other, then select Calendars -> CalDAV calendar.
3. Enter your username and password and press Next.
4. If “cannot connect using SSL” appears, press Cancel.
5. Press Advance and change the port from 8443 to 443.
6. Press “calDav”, then Next.
7. If “Unable to Verify Certificate” appears, press “Accept” or “Continue”.
8. Press Save.