We are considering moving from an on-prem Exchange 2016 server to Office 365, but we have several mailboxes with high message volume. These mailboxes are used to receive a large amount of messages from our hosted CRM, and also relay messages from the CRM to external recipients. We've had to modify the frontend receive connector on the server to allow for the message volume, but this is something we can't do in Office 365 - we're stuck with the 3600/hour receive and 30/minute send limits. So I'm trying to determine a way to find out how many messages each of these mailboxes receive per hour, and how many they are sending per minute. Is there a way in the web console or EMS to get this info?
