Join Teams work meetings from Microsoft Teams (free) and vice versa

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Microsoft Teams (Free) users can currently join Teams for work (or school) meetings only as guests, which requires them to use a browser and results in a sub-optimal experience. The new feature rolling out will allow these users to join Teams for work (or school) meetings in one click, without being redirected to the browser or asked to fill in their name/surname. They will also be able to continue collaborating with the meeting organizer and other participants via meeting chat after the meeting.  The feature will work in the opposite way as well, so Teams for work (or school) will just as easily be able to join meetings hosted by a Teams Free user with one click. This is associated with Roadmap ID: 167326
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Teams 9x9 video in meetings should be hitting your tenant soon

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This is another feature many have been waiting for. An increase in the number of simultaneous video streams in a meeting is supposed to be rolling out late April / Early May.

According to the road-map this will automatically be available, but the client will try to decide the best view for each user based upon media and video quality (network capability). It can be an idea to inform the users of this, so they understand why (potentially) their meetings might have 2x2 OR 3x3 video layout.