Outlook for web will migrate to a new appID. The existing Microsoft-owned appID used by OWA is changing in preparation for OWA’s authentication platform migration to a SPA auth model using MSAL.
When this will happen:
Standard Release: We will begin rolling out the first half of Calendar year 2024 and expect to complete by the 4th quarter of calendar year 2024.
How this will affect your organization:
What are the appIDs involved?
What you need to do to prepare:
No action required. This is primarily a back-end change, and we are offering this awareness as the new appID will be visible in security reports.