CalDAV synchronizes a calendar with the iPhone Calendar app. It is separate from the IMAP connection used for email.

Prepare the calendar details

Check that your Email PRO service supports CalDAV. Obtain the server URL, calendar path and credentials from your service settings or support. The path may be account-specific.

Add the account on iPhone

  1. Open Settings and Calendar accounts. Depending on iOS, Calendar may be under Apps.
  2. Choose Add Account, then Other and Add CalDAV Account.
  3. Enter the server and service credentials.
  4. Check advanced settings, the account URL and HTTPS when these fields are available.
  5. Save and enable the calendar in the app.

Test synchronization both ways

Create an event on the iPhone and check that it appears in Webmail Calendar. Then edit it in Webmail and check the change on the iPhone. Timing depends on connectivity and synchronization settings.

If the calendar does not appear

Check that it is enabled in the calendar list, that the URL belongs to the account and that the HTTPS certificate is valid. An IMAP server address does not replace a CalDAV URL. If your plan lacks the option, ask support to confirm availability.

Reference documentation:

Sources accessed on October 11, 2026. Available features depend on your hosting version and options.