Change room mailbox that are synched from AD to pure cloud

[Marvin Oco]

We previously have exchange hybrid, local exchange is already deprovisioned but room mailboxes are still tagged as synched from AD.

How do we Change room mailbox that are synched from AD to pure cloud?

Tnx

[#2]

Hi @Marvin Oco good morning. 

You can do it from Exchange Admin or by Powershell. 

Please, check this link, is old but can guide you. 

Office 365: How to migrate on-premises Resource (room) mailboxes - TechNet Articles - United States ...

I hope this can help. 

Good luck!

[#3]

Hi, the exchange server on premise is now decommissioned /
Not available. Any other ways? Tnx

[#4]

Hi @Marvin Oco 

If Exchange is already decommissioned, why not you create the Room mailboxes from Exchange Admin portal directly? 

Are you using Azure AD connect? 

Thanks!

[#5]

Yes using ad connect. How do we purge the "ad synched room mailbox"?

[#6]

Hi @Marvin Oco 

If you are using Azure AD connect, I presume your Room mailbox was synced in Office 365 as user mailbox. In that case, you can convert this user mailbox to a room mailbox. 

You can use exchange online powershell and run "Set-Mailbox YourUser -Type Room"

Also, here you can find more info:

Create and manage room mailboxes | Microsoft Docs

I hope this can help. 

Good luck!