RoomBusy When They Are Actually Available

Question

RoomBusy When They Are Actually Available

pariyanto 20

hi..

when i create new book meeting with microsoft teams, and choose rooms, it show up as busy

but when i create meeting with outlook it show up as free.. anyone know for this issue ? and how to fix it.

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Answer accepted by question author

Anonymous

Hi @pariyanto

Thank you for posting your question in the Q&A Forum.

The behavior where a room shows Busy in Teams but Free in Outlook usually indicates that the two clients are interpreting free/busy data differently. This is often caused by cached data or specific room mailbox configurations.

To help narrow this down, please try the following steps:

1. Test with Teams Web first

Please try scheduling the same room using:
https://teams.microsoft.com

If the room appears FREE on Teams Web:
The issue is likely due to cached data in the Teams Desktop Client.
If the room appears BUSY on Teams Web:
The issue is likely related to the Room Mailbox settings on the server side.

2. Verify the room calendar directly

Open the room mailbox calendar in Outlook (Open Shared Calendar) and check whether:

There are hidden or recurring events blocking the slot
Any tentative or auto‑accepted meetings exist

Sometimes these do not show clearly in the Teams scheduling pane.

3. Review Room Mailbox Booking Settings

If you have Admin access, please check the Calendar Processing settings via PowerShell:

Get-CalendarProcessing -Identity "<room_mailbox_email>"

Key fields to look at:

AutomateProcessing
AllowConflicts
BookingWindowInDays
WorkingHoursStartTime / WorkingHoursEndTime / WorkingHoursTimeZone

Incorrect working hours or mismatched time zone can cause Teams to interpret the room as unavailable while Outlook still shows it as free.

If the issue continues after these steps, please share the results and we will assist you further.

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

pariyanto 20 Reputation points

2026-02-19T03:09:24.58+00:00

Hi @Anonymous ,

thank you for your feedback.

it's look like i have an issue about workinghoursstarttime and workinghoursendtime. it's been solved via powershell.

but i have another question, is it outlook have no impact about the workinghours time ? because yesterday teams couldn't reserved room but outlook could
Anonymous

2026-02-19T08:01:12.1166667+00:00

Hi @pariyanto

You're correct. Outlook is generally not affected by the room’s WorkingHours settings. It simply checks whether an actual event exists on the calendar, and if the slot is empty, Outlook will show it as Free.

Teams, however, evaluates the mailbox’s WorkingHours configuration as part of its availability logic. This is why Teams interpreted the room as unavailable while Outlook still allowed the booking.

Glad to hear everything is working now. Let me know if you have any further questions.
pariyanto 20 Reputation points

2026-02-19T08:12:24.6933333+00:00

Thank you @Anonymous
Anonymous

2026-02-19T08:18:27.2166667+00:00

Hi @pariyanto

You're very welcome! I'm glad I could help you resolve this. Have a great day!

1 additional answer

Your answer

pariyanto 20 Reputation points

2026-02-19T03:09:24.58+00:00

Hi @Anonymous ,

thank you for your feedback.

it's look like i have an issue about workinghoursstarttime and workinghoursendtime. it's been solved via powershell.

but i have another question, is it outlook have no impact about the workinghours time ? because yesterday teams couldn't reserved room but outlook could
Anonymous

2026-02-19T08:01:12.1166667+00:00

Hi @pariyanto

You're correct. Outlook is generally not affected by the room’s WorkingHours settings. It simply checks whether an actual event exists on the calendar, and if the slot is empty, Outlook will show it as Free.

Teams, however, evaluates the mailbox’s WorkingHours configuration as part of its availability logic. This is why Teams interpreted the room as unavailable while Outlook still allowed the booking.

Glad to hear everything is working now. Let me know if you have any further questions.
pariyanto 20 Reputation points

2026-02-19T08:12:24.6933333+00:00

Thank you @Anonymous
Anonymous

2026-02-19T08:18:27.2166667+00:00

Hi @pariyanto

You're very welcome! I'm glad I could help you resolve this. Have a great day!

Answer 1

The issue you are experiencing, where a room appears as busy in Microsoft Teams but free in Outlook, may be related to the calendar settings for the room mailbox. Specifically, it could be due to invalid settings for the working hours of the room mailbox, which can affect how availability is displayed across different platforms.

To troubleshoot and resolve this issue, you can check the calendar settings for the room mailbox using PowerShell. Here are the steps:

Run the following PowerShell cmdlet to check the calendar settings of the room mailbox:

   Get-DistributionGroupMember -Identity <room list name> | Get-MailboxCalendarConfiguration | FL Identity,WorkingHours*

Look for any discrepancies in the WorkingHoursStartTime, WorkingHoursEndTime, and WorkingHoursTimeZone settings. Ensure that the start time is less than or equal to the end time and that the time zone is set correctly.

If you find any invalid settings, you can correct them using the following cmdlet:

   Set-MailboxCalendarConfiguration -Identity <room ID> -WorkingHoursStartTime <start time> -WorkingHoursEndTime <end time> -WorkingHoursTimeZone <time zone>

By ensuring that the working hours are correctly configured, you should be able to resolve the discrepancy in availability status between Microsoft Teams and Outlook.

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RoomBusy When They Are Actually Available

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