Hi everybody,
recently we upgraded from Zimbra 6 to 7.2.1, and consequently we upgraded our Zimbra Desktops. Everything works fine, except for one error popup ("offline.MISCONFIGURED" / "configuration error: incorrect mailbox class: LocalMailbox") that comes out when creating an appointment: I create the appointment, then I add the attendees (and the scheduler shows their free/busy status), then if I change the date or time of the appointment, the error popup comes out. If i click on ok, the error disappears, and the appointment creation ends successfully, every attendee receives the invite.
Here is the error report:

Do you have any clue? That popup is a bit annoying
Thank you in advance.