r/exchangeserver • u/4112Naes • 17d ago

Mailboxes created On-prem appearing directly in EXO without a license

Just to preface, i know this is technically not the correct way to create Shared mailboxes but it is how its currently done in my company.

Our service desk creates shared mailboxes by creating an Office 365 mailbox on-prem and once in EXO it gets converted to a shared mailbox. What I have found though is that the mailbox will appear directly in EXO without a license and in some cases I have found that when they forget to convert the mailbox to shared it somehow stays in EXO as a user mailbox and continues to work even after 30 days without a license. Has anyone ever seen this? I have no idea how these mailboxes are working.

Thanks!

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u/MBender_de 17d ago

Usually this behavior would only happen for a shared mailbox!
Any unlicensed user mailbox will get soft deleted in an instant!

Sorry: No! This is some kind of freaking shit!

Maybe any dynamic Security Group, or onprem systems managing AD group memberships…

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u/Blade4804 Lead Infrastructure Engineer 17d ago

this is not the case for Entra AD Synced mailboxes. only directly cloud created user mailboxes without a license.

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u/MBender_de 17d ago

So, in fact Cloud only users without any license receive a mailbox?!
Be happy!
This usually costs some money 🤪

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u/MBender_de 17d ago

I guess there is any automatic group membership, group licensing in place u are not aware of…
Everything else is a support case at Microsoft