Running Zimbra Desktop and getting an error deleting a folder. The folder was imported from Gmail and may be causing an issue as it was imported into inbox with the name inbox. Can I delete this (manually) as the UI gives me the following error.

method: FolderActionRequest
msg: cannot modify immutable object: 858
code: mail.IMMUTABLE_OBJECT
detail: soap:Sender
trace: btpool0-83:1256012755890:d81c136c6d3500ac
request:

xxx@rxxxs.com0_554ddb2f789f1bd53350d1bbd0c3fae0f74aa002_69643d3 3363a66666666666666662d666666662d666666662d6666666 62d6666666666666666666666663b6578703d31333a3132353 63035343636333738313b747970653d363a7a696d6272613b