Thank you for your feedback.
Today you can see messages which are “pending” in a queue through Message Trace feature. In the Mail flow Dashboard, you can see messages queued for more than an hour. We’ve also created alerting for this condition. Can you tell us what other things you need and what the scenarios look like / how commonly you need to perform the task?
This would help us when evaluating this item further.David Lockridge commented
Mike is correct on this. Being able to see "Pending" is really not much of a value because we really can't do anything with it besides say "yes, the message is pending". Being able to initiate a retry on a queue or message would be extremely beneficial as we have no control over this currently in EXO.David Lockridge commented
Echoing the comments here... having the ability to view our mail queue and/or release something in retry is a fairly critical component to messaging administrators. If we can only see "our" data in the O365 portals, we should be able to only see "our" email in a queue viewer.
We are planning to show the membership of a group in the contact card in Outlook for Mac.