This may be related to earlier problems with this virtual server. Look here.

I noticed today that two of our clients have the same Info@ mail box.

I dont know how this is possible but when I removed both of info@domain1& boxes and tried to recreate them the problem reoccured.

I can't delete the Shares of info1@ on the clients Briefcase and Docs view.
I can see them but they will not show right click menu with the delete command.

I'm wondering what to do now?
I saw this tip and I'm wondering if this would help?
Documents - Disabling or Removing - Zimbra :: Wiki