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How to Use an Existing Shared Calendar with Microsoft Bookings

Phi Hung VoPhi Hung Vo Oct 20, 2026 869 views

Question details

The user wants to know if an existing shared calendar and mailbox can be integrated into Microsoft Bookings for managing staff training reservations.

How to Use an Existing Shared Calendar with Microsoft Bookings
Product
Microsoft Bookings
Device & OS
not provided
Scenario
Setting up staff training-course reservations using an already established shared mailbox and calendar.
Observed behavior
Seeking a method to route bookings to an existing shared calendar to avoid creating redundant mailboxes and calendars in the organization.
Before you start

Ensure you have Microsoft 365 administrator privileges or sufficient permissions to manage shared mailboxes and add staff members to Microsoft Bookings.

Solution 1Recommended

Add the Existing Shared Mailbox as a Staff Member

You can route Bookings appointments to an existing shared calendar by adding the shared mailbox as a 'Staff' member in your Bookings configuration.

While Microsoft Bookings automatically creates its own default mailbox for every new Bookings page, you do not have to use it for your daily calendar management. By adding your organization's existing shared mailbox as a 'Staff' member, you can sync Bookings directly to that shared calendar.

1
Open Microsoft Bookings

Log in to your Microsoft 365 account, open the app launcher, and select Microsoft Bookings. Navigate to your specific Bookings calendar.

2
Navigate to the Staff Page

In the left-hand navigation menu, click on 'Staff' and then select 'Add new staff' at the top of the page.

3
Enter Shared Mailbox Details

Type the email address of your existing shared mailbox into the 'Initials' or 'Search for people' field. Set their role to 'Viewer' or 'Guest' depending on your security preferences.

4
Enable Calendar Syncing

Check the box that says 'Events on Office calendar affect availability'. This ensures Bookings reads the shared calendar's free/busy times and avoids double-booking.

5
Assign to Services

Go to the 'Services' tab, select your training course, and assign this newly added shared mailbox as the dedicated staff member for the service.

Add the Existing Shared Mailbox as a Staff Member
Integration Complete: All new reservations made for this service will now populate directly onto your existing shared calendar.
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Frequently Asked Questions

Does Microsoft Bookings automatically create a new mailbox?

Yes, when you set up a new Bookings calendar, Microsoft 365 automatically generates a new, hidden shared mailbox in the Exchange environment to store the booking data and settings.

Why isn't Bookings reading my shared calendar's availability?

Ensure that the shared mailbox has been added as a Staff member, the 'Events on Office calendar affect availability' toggle is turned on, and that the Bookings app has the correct Exchange permissions to view the shared mailbox's free/busy data.

Can I change the email address that Bookings uses to send confirmations?

By default, Bookings uses the email address of the automatically created mailbox. However, an Exchange Administrator can modify this address or assign a specific alias via the Microsoft 365 Admin Center to make it match your brand.