While accessing the WI (Windows Interface), you may find that the mailbox Rights from Exchange can not be read or are not displayed.
Mailbox Rights are not shown in ARS WI when non-english names of well known Security principals are returned by Get-MailboxPermission cmdlet. This relates to environments configured in other languages than English (i.e. Exchange having German locale).
This is a product defect (TF0386698), due to use of hardcoded names inside of the ARS lookup procedure.
None. Contact support for hotfix.
Waiting for fix in a future release of ActiveRoles Server. Product defect has been submitted (TF0386698).