We currently use (mail enabled) Public Folders together with distribution lists to stora all project communication and notify all members.

The new Office 365 Groups would offer similar functionality, however we are missing ability to create subfolders in Group mailbox to organise the mailbox.

For example:
Group "Project X" displays in Outlook as:

Groups
>Project X

Which we would like to organise as following:

Groups
> Project X
>>Client
>>Subvendors
>>Internal

This would also require ability to drag and drop emails inside Group mailbox.

It would be nice to hide or remove the "Groups" on the left Tree in Outlook. And to also hide the Groups in the Address Book.

Note: We use Office 365 with AD Sync. We also use PowerBI Groups which created a whole load of groups. We don't want to see PowerBI groups in Outlook!!!

If the reading pane is off in Outlook you cannot open Modern Group messages. We would like to be able to double click on group messages to open them in a new window, similar how you can do with mail items.

Provide an option to Groups to sort and View emails using LastName, FirstName in Microsoft Outlook 2016

We would like a count of members in a contact group.

In Outlook groups, you can like messages. It would be great if we could search/filter on messages that are liked or not liked.

One Click Navigation to all my Groups
I've started to use Office 365 Groups but its a little frustrating that I have to navigate down the left navigation to find my groups, then click on more to get to the one I want. Please create a landing page for all my groups that I can add to my favorites and then click to see all the of them

Associate a dedicated Group inbox (like in SharePoint), which we could Cc or Bcc for each email that could interest the Group.

Provide a feature to move and email item to Group Conversation folder in Microsoft Outlook 2016 to get rid of the extra Distribution List folder that may be required otherwise.

Provide an option to right click on a Microsoft Groups folder to Mark all as read in Microsoft Outlook 2016

When I receive an email with multiple DL, Outlook should show me which DL I am part of that is causing me to receive that email. This will cut down on clutter by allowing me remove myself from that DL if I do not want to receive the email.

I have several outlook groups which can be emailed from external senders. I would like to be a able to review the emails that are marked as junk by outlook but I don't see how that can be done.

There should be a way to review emails marked as junk so we can mark emails that are not junk as 'not junk'.

Apologies if this suggestion has landed in the wrong category. For context, here's my question in the forum that referred me here:
https://answers.microsoft.com/en-us/outlook_com/forum/oemail-ocleanup/groupmail-where-can-i-view-junk-mail-sent-to-a/8fc11d58-4712-4c33-b201-a9d8a7b1c6c9

Provide a feature to enable safer deletion of emails in Groups and recovery as well in Microsoft Outlook 2016 plus add a warning to let people know that they are deleting the ENTIRE group, not just one member.

Provide a feature to setup Rules and Alerts for a 'Groups' inbox in Microsoft Outlook 2016 notifications can be auto-forwarded from the Planner to the individual who has been assigned the task.

Provide a feature to sort Group Contact list (Distribution List) in Microsoft Outlook 2016 using Company Name to track email communication more efficiently.