💡 Our Technical Review in summary
Summary
- Message ID: MC906502 (Updated March 19, 2026).
- Core Update: Microsoft is introducing a feature to ensure that automapped calendars are automatically displayed when a user switches from classic Outlook for Windows to the new Outlook for Windows.
- Roadmap ID: 415168.
- Timeline:
- Targeted Release: Late April 2026 through late May 2026.
- General Availability: Late May 2026 through late June 2026.
Impact
- User Experience: Previously, users transitioning to the new Outlook for Windows had to manually re-add or locate calendars that were automapped in the classic version. This update removes that friction by preserving the visibility of shared calendars linked via automapping.
- Migration Parity: This change brings the new Outlook closer to feature parity with the classic version, specifically regarding how shared mailbox permissions and Exchange automapping function.
- Default Status: This feature is enabled by default. No administrative configuration is required to activate the synchronization of these calendars.
- Support Volume: IT departments may see a decrease in support tickets related to “missing calendars” or shared mailbox visibility issues when users trial or migrate to the new Outlook interface.
Action Required
- Documentation: Review and update internal IT knowledge base articles and “New Outlook” migration guides to reflect that manual re-addition of automapped calendars is no longer required after the rollout dates.
- User Communication: Inform power users or departments that rely heavily on shared mailboxes (e.g., HR, Finance, Admin teams) about this improvement to encourage the adoption of the new Outlook client.
- Help Desk Readiness: Ensure support staff are aware of the revised timeline (completing by June 2026) so they can distinguish between synchronization delays and actual permission issues.
- Technical Verification: No admin action is needed on the Exchange backend; the process relies on existing automapping attributes already present in the user’s Exchange profile.
Microsoft Official Update
Service: N/A
Category: stayInformed
Severity: normal
Updated March 19, 2026: We have updated the timeline. Thank you for your patience.
Coming soon: Users will be able to automatically see their automapped calendars when toggling from classic Microsoft Outlook to new Outlook for Windows. This message applies to classic Outlook for Windows desktop and new Outlook for Windows desktop.
This message is associated with Microsoft 365 Roadmap ID 415168.
[When this will happen:]
Targeted Release: We will begin rolling out in late April 2026 (previously mid-March) and expect to complete by end of May 2026 (previously end of March).
General Availability: We will begin rolling out end of May 2026 (previously mid-April) and expect to complete by end of June 2026 (previously end of April).
[How this will affect your organization:]
Before this rollout, users were not able to see their automapped calendars when toggling from classic Outlook to new Outlook.
To access an automapped calendars, users can go to Microsoft Outlook > Calendar icon on left of screen > My Calendars > Automapped calendar.
This feature is on by default.
[What you need to do to prepare:]
This rollout will happen automatically by the specified date with no admin action required before the rollout. You may want to notify your users about this change and update any relevant documentation.
Learn more
- The section called Use the shared calendar from the shared mailbox in Open and use a shared mailbox in Outlook – Microsoft Support
- Definition of automapping: Remove automapping for a shared mailbox – Outlook | Microsoft Learn
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