Calendar Problems

How to Configure Outlook and Exchange Room Calendar Permissions

Maira Mehtab Sep 22, 2026 869 views

Question details

Users are experiencing inconsistent visibility of room bookings and private meetings after migrating from Exchange to Microsoft 365.

Product: Microsoft Outlook and Exchange
Device & OS: not provided
Scenario: Configuring room calendar permissions and access rights post-migration to Microsoft 365.
Observed behavior: Some users can see room bookings while others cannot, private meetings are hidden, and visibility differs between various rooms.

Before you start

Ensure you have Microsoft 365 Global Administrator or Exchange Administrator privileges to review and modify mailbox types and permissions.

Solution 1Recommended

Verify Mailbox Type and Update Permissions

Check whether the resource is configured as a room mailbox or a standard user mailbox, as room mailboxes inherently expose availability for bookings.

Room mailboxes in Exchange are specifically designed for resource booking and generally allow users within the organization to view their availability. If a standard user mailbox is mistakenly being used as a room resource, default sharing permissions will be restricted.

Check the mailbox type

Log in to the Exchange admin center and verify if the resource is listed under 'Resources' as a Room Mailbox rather than a standard user mailbox.

Update user permissions

If a user mailbox must be used as a room, open its calendar sharing settings and grant the necessary users 'Reviewer' permission so they can see booking details.

Test visibility

Ask an affected user to view the calendar in both Outlook desktop and Outlook on the web to ensure the entire calendar and booking details are now visible.

Private Items: Meetings marked as 'Private' by the organizer will remain hidden unless the delegate is explicitly granted permission to view private items.

Solution 2

Escalate Migration Issues to Microsoft Support

If permission inconsistencies persist after verifying mailbox types, escalate the post-migration issue to Microsoft Support.

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Frequently Asked Questions

Why can some users see room calendar details while others only see availability?

This usually occurs due to varying calendar sharing permissions. Users explicitly granted 'Reviewer' access can see meeting details, while the default organizational permission might be set to show only 'Free/Busy time'.

How do I change default permissions for an Exchange room calendar?

Administrators can change default calendar permissions using Exchange Online PowerShell. By running the 'Set-MailboxFolderPermission' cmdlet on the room's calendar folder, you can modify the default access level for all users.

Does migrating to Microsoft 365 change my room calendar permissions?

Migrations from on-premises Exchange to Microsoft 365 can sometimes reset or alter legacy permissions. Administrators often need to re-evaluate and re-apply least-privilege configurations in the cloud environment to restore proper access.

Outlook & Email Problems