Calendar Problems

Can You Share a Microsoft 365 Group Calendar Across Tenants?

Camila Milosovich Sep 27, 2026 869 views

Question details

Understand whether it is possible to share a Microsoft 365 Group calendar with users from a different tenant or organization.

Can You Share a Microsoft 365 Group Calendar Across Tenants?

Product: Microsoft 365
Device & OS: not provided
Scenario: Attempting to collaborate and share a centralized group calendar with external users or guests in a separate Microsoft 365 organization.
Observed behavior: Cross-tenant sharing works for individual user calendars but appears restricted or unavailable for Microsoft 365 Group calendars, preventing guests from directly accessing the calendar.

Before you start

Verify that you have admin or owner rights to the Microsoft 365 Group, and ensure the external users are added as guests in your organization's directory.

Solution 1Recommended

Invite Guest Users to Microsoft 365 Group Events

Since direct cross-tenant sharing of a Microsoft 365 Group Calendar is not supported, the best alternative is to invite external guests directly to group events.

Microsoft 365 Group calendars cannot be directly shared cross-tenant in the same way as individual personal calendars. External or guest users cannot open or view the group calendar directly from their own tenant.

However, guest users can still participate by receiving standard calendar invitations for events created by the group. Once accepted, these events will appear on their personal calendars.

Access the Group Calendar

Open Outlook and navigate to your Microsoft 365 Group Calendar from the navigation pane.

Create a New Event

Click on 'New Meeting' or 'New Event' while within the Group Calendar view.

Add External Guests

Add the external guest's email address in the 'Required' or 'Optional' attendees field.

Send the Invitation

Complete the meeting details and send the invitation. The guest will receive an email invite and can add it to their own personal calendar.

Invite Guest Users to Microsoft 365 Group Events

Guest Access Limitations: Guests cannot view the full group calendar schedule; they will only see the specific events they are explicitly invited to and accept.

Solution 2

Share a Personal Calendar as a Workaround

If cross-tenant visibility of a full schedule is essential, use an individual user calendar instead of a Group calendar, as individual calendars fully support cross-tenant sharing.

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Frequently Asked Questions

Can I use organization sharing policies to share a Microsoft 365 Group calendar?

No. While organizational sharing policies allow users to share or publish their own personal calendars externally, these policies do not apply to or provide equivalent access for Microsoft 365 Group calendars.

What can a guest user see in a Microsoft 365 Group?

Guest users cannot directly access or view the group calendar schedule. However, they can receive email invitations to specific group events, participate in group email conversations, and access shared group files if permissions allow.

Is there any way to sync a Group calendar with an external tenant?

Currently, there is no native Microsoft 365 feature to fully sync or share a Group calendar across different tenants. You must rely on sending individual meeting invites to external guests, using a shared personal calendar, or utilizing third-party synchronization tools.

Outlook & Email Problems