With this update, any Calendar updates you make in outlook will be available in near-real time on Teams Calendar (Desktop/Web). This keeps your calendar across Outlook and Teams always in sync with each other.
This message is associated with Microsoft 365 Roadmap ID 138248
[When this will happen:]
Standard Release: We will begin rolling out mid-September and plan to finish rollout by mid-October.
[How this will affect your organization:]
Teams users in your organization will have a more reliable calendaring experience whether they are using any of the two calendars (Teams or Outlook). Calendar events they create/edit/delete on Outlook will reflect in near real-time on Teams calendar.
[What you need to do to prepare:]
Nothing required from users or admins.