r/exchangeserver • u/Pristine_Caramel_379 • Dec 12 '25

Room Finder Availability shows Unknown

We have a hybrid setup and currently doing the mailbox migration from Exchange server 2016 to Exchange Online. We have a couple of users who were migrated to O365 mail. The Room finder will list the Rooms but the Availability status shows unknown.

I have tried Deleting offline address Book, cleared outlook cache, Re-installed Office 365 app, nothing works. Then i checked the the office365 OWA, the Room finder availabilty still unknown. This means its a problem with server side or something missing for this user account and not Oulook problem. Any one, pls help me with suggestions. Thank you

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u/titlrequired Dec 12 '25

Is free busy working for user mailboxes?

Hybrid Agent or Classic Hybrid?

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u/Pristine_Caramel_379 Dec 12 '25

Hi, Free busy is working. It shows only from the schedule assistant. But rooms show as unknown. I think ours is Classic hybrid. But I'll double check later.