The Riva Cloud release notes list the benefits of this release:
Global Data Center Support
Benefits of this Release
The Riva Cloud Connections page clearly indicates when the email connection is an EWS connection group:
For more information, see Connection groups.
For Dynamics CRM subscriptions and subscriptions that use mail group gathering: If the subscription limit has been reached and users were not added to the sync policy, an email notification is sent to the admin or technical contact.