Zimbra License Requirements for ZCS Network Edition ZCS licensing gives administrators better visibility and control into the licensed features they plan to deploy. The following is a summary of the feature attributes of a ZCS network edition license. Number of mailboxes assigned globally. Number of Zimbra Mobile users. The feature can be enabled or disabled by the administrator using Class of Service. Number of Outlook Connector users. The feature can be enabled or disabled by the administrator using Class of Service. Number of Archiving users assigned globally. Number of Attachment indexing users assigned globally.