Microsoft Dynamics CRM uses Exchange Web Services (EWS) to synchronize meeting items between your application and the Exchange server. When the EWS Managed API calls the TimeZoneInfo.FindSystemTimeZoneById() method, if the method passes a null value, an exception occurs.
To resolve this issue, install the following update:
2936880 Cumulative Update 5 for Exchange Server 2013
Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section.