Set the Class of Service

To change the assigned class of service (COS) template for several mailboxes at once, select the mailboxes to edit, right-click on any one of them, and then select Edit | Set | Class of Service from the context menu.  The figure below shows the dialog that appears, listing all active class of service templates from which you can choose.

Select the template to assign and click OK.

The system will edit each mailbox, replacing the assigned class of service with the template you selected.  If any mailbox is currently in use (i.e., the subscriber is logged in), the system will not be able to change the COS and will have to skip over that mailbox; you will be informed if this happens.