The main performance issues in a Microsoft Exchange Server 2013 environment that's running BlackBerry Enterprise Server 5 are as follows:
- logon failures
- receiving non-delivery reports
- a high CPU usage
This issue occurs because Exchange Server 2013 hasn't materialized the new restriction from BlackBerry Enterprise Server 5.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.