There are WAY too many tab-like layers in the UI leading to many ways to see the same content and inconsistent badges/indicators.

Suggestions:
1. Remove the side bar with "Activity", "Chat", "Teams", etc. Switching between them constantly is very annoying.
2. "Activity" should cease to exist. I should be able to see the most recent activity in a flat UI via badges.
3. Make badges or indicators consistent. Using a red badge for unread messages AND then on the contacts using a red badge for busy status is very confusing to a casual glance to see what you missed. I would use something like a blue badge on the right side of the contact instead of bold, to indicate new messages.
4. Make the last thread reply field auto-focus. We keep starting new threads! Perhaps allow for flat channels with only 1 thread.
5. Better space usage. If I resize my window horizontally, the messages have a max width. The threads within channels add a lot of padding vertically. Even zooming out doesn't help, as the max width remains.
6. When I scroll any little bit, messages have to load. There should be at least some scroll back pre-loaded.
7. Allow custom grouping/ordering of teams/contacts/group/chats. They should all be on the same list. Currently we have to switch between Chat->Contacts and Chat->Recent to view individuals vs pinned group chat under recent, then Teams->{Team Name}->Channel->Thread. Get rid of threads, allow renameable bookmarks or shortcuts to channels. The only place you should see other channels in a "team" should be when joining.
8. Allow @mentions to include anyone organization-wide in public teams.
9. "Teams" seems a misnomer for "Rooms", because I'm not on all of those teams, but I have to add myself to join a room.
10. Optionally show who is in a room in a list on the right, instead of having to drill down to see who is there.
11. Allow more drag-drop organizing, such as adding people to a team or group chat, or reordering, etc.
12. Group chat has a cleaner interface than teams do, but cannot be found/joined. There shouldn't be two interfaces for similar functionality. We should get rid of threads in channels like group chats, and allow channels to be private so they can be by invite only. Then group chat is not needed.

Have a "room mode" in the desktop version of the app.

Currently we rely on a meeting room computer with a consumer Skype account. We will inevitably one day get a proper room system, but in the meantime we already have what we need equipment wise... just not software-wise.

It would be useful if you could setup a desktop installation of MS Teams as a meeting room so that staff do not need to login with their accounts (which they would then forget to log out of), or have dedicated meeting room users.

Maybe this is already possible and I've missed a trick?