Calendar Problems

Fix Microsoft Bookings Showing All Availability as Unavailable

John Wilson Oct 20, 2026 869 views

Question details

The user needs to resolve an issue where Microsoft Bookings marks all available time slots as unavailable after a single appointment is booked.

Product: Microsoft Bookings
Device & OS: not provided
Scenario: Managing staff availability and scheduling services in Microsoft Bookings linked to an Outlook calendar.
Observed behavior: All remaining days and time slots disappear or show as unavailable after one appointment is booked, typically because time blocks are marked as Tentative in the linked Outlook calendar.

Before you start

Ensure you have administrative or staff management access to your Microsoft Bookings page and are logged into the associated Microsoft 365 account.

Solution 1Recommended

Disconnect Outlook Calendar Events from Bookings Availability

Stop Outlook calendar events from blocking your Microsoft Bookings availability.

By default, Bookings uses your Outlook free/busy information to determine available time slots. Disabling this feature ensures that Outlook calendar entries, such as tentative meetings, do not hide your booking availability.

Open Staff Settings

Go to Microsoft Bookings and click on the 'Staff' option in the left navigation menu.

Edit Staff Member

Select the affected staff member from the list and click on 'Edit staff'.

Adjust Availability

Scroll down to the 'Availability' section.

Disable Calendar Sync

Uncheck the box that says 'Event on Office calendar affects availability'.

Save Changes

Click 'Save' to apply the changes. Your Bookings page will now ignore Outlook events.

Disconnect Outlook Calendar Events from Bookings Availability

Availability Restored: Bookings will now ignore Outlook calendar events, preventing tentative blocks from removing open time slots.

Solution 2

Change Outlook Calendar Status to Free

Keep the calendar sync active but ensure blocked times are properly managed in Outlook.

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Frequently Asked Questions

Why does Microsoft Bookings treat 'Tentative' as unavailable?

By default, Bookings interprets any status other than 'Free' in Outlook (such as Busy, Tentative, or Out of Office) as blocked time to prevent potential double-booking of your staff.

Can I block off time in Outlook without affecting Microsoft Bookings?

Yes. You can either mark the specific Outlook event as 'Free' so Bookings ignores it, or disable the 'Event on Office calendar affects availability' setting in the Bookings staff menu entirely.

Do changes to staff availability apply to all services?

Yes, if you change a staff member's availability settings, it will apply to all services they are assigned to in Microsoft Bookings, unless you have configured service-specific override hours.

How long does it take for Outlook calendar changes to reflect in Bookings?

Changes made to your Outlook calendar usually sync with Microsoft Bookings almost instantly, but occasionally it can take a few minutes for the public booking page to fully update.

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