When this will happen:

We will begin rolling out early October 2023 and expect to complete by late October 2023.

How this will affect your organization:

In addition to the notifications they already receive for reactions, Outlook Mobile users will start to see notifications in the Notifications Pane when they are mentioned in an email, a Microsoft 365 document, or a Loop. Currently there are no push notifications associated with these in-app notifications.

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What you need to do to prepare:

This feature works with no user or tenant intervention necessary.