Cannot delete mailbox

[Gr1pen]

After a power outage zimbra ldap became corrupted. I managed to fix that but then I noticed that I could not create new appointments in the calendar.
I ended up exporting the mailbox with zimbra desktop, creating a new maibox and import the content, changing login name and aliases. All fine.

But when I now try to remove the old mailbox I get this error:

system failure: dropMailboxFromGroup(5) Felkod: service.FAILURE Method: [unknown] Information:soap:Receiver