Rollout begins early March and should be complete by late March 2021.
How this will affect your organization
Users will access Mail, Calendar, Contacts, To Do, and other Outlook experiences along the left side of the folder pane. Users can also launch Word, Excel, PowerPoint, and OneNote on the web, Yammer, and other Microsoft 365 applications directly from the app bar.
What you need to do to prepare
You might want to notify your users about this new capability and update your training and documentation as appropriate.