As of today (2021/06/29), the addin is available for:
All M365 customers
Using Outlook with a Microsoft 365 subscription (Outlook on Windows, and Outlook on the web).
Outlook must be installed with the license included in your o365 subscription
Some Microsoft subscriptions do not include Outlook desktop
Only on Windows (MAC not yet covered for Outlook desktop)
OWA and Outlook desktop
No limit on number of users
Minimum Outlook version required: v16.0.14026.
How to know the version of your Outlook?
In Outlook desktop, click on File / Account Office / About
(click on the image below to see the step by step video)
For Outlook desktop, to date (2021/06/29) you must be on the current channel to be able to use the functionalities of the V1 of the addin
For Outlook on the web, at the date (2021/06/29) you have to be on the Standard version to be able to use the functionalities of the V1 of the addin.
How to know your Office channel?
In Outlook desktop, click on File / Office Account / About
Click on the picture above to see the instructions (video).