Decommissioning On Premise Exchange after O365 migration

AD Azure connect is syncing the local AD and Azure.  All mailboxes have been migrated.   My understand is that we have to purchase as many CALs as number of mailboxes we have, no matter where the mailboxes are stored (on premise or Office 365)   As we no longer run anything on the on premise Exchange I would have liked to decommission the server.

But it looks like we need to run at least one one premise Exchange to keep syncing some attributes.

Workaround is not supported by Microsoft.  

Is there something we could think of to get rid of the on premise Exchange?  

Thanks
kt3zAsked:
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timgreen7077Exchange EngineerCommented:
You are correct, keep at least one of the exchange servers on-prem for management. If you choose to delete it then you will have to use ADSIEdit to manage certain aspects of the object which can be a pain. See the link below for more info on the decom but leave at least one Exchange server.

https://technet.microsoft.com/en-us/library/dn931280(v=exchg.150).aspx

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kt3zAuthor Commented:
I've been reading several articles including this one.  I was hopping for a miracle I guess.  I understand that somehow, someday Microsoft wants to keep a door opened to move it back some mailboxes on the on premise.  But I think they should come up with something less heavy than an Exchange server (CALs, VM license..) for those who just want to get rid of the on premise Exchange.

Thanks
timgreen7077Exchange EngineerCommented:
agreed, but unfortunately no miracle yet 😁
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Cliff GaliherCommented:
CALs are *not* needed in this kind of scenario. Nor even an exchange server license. You do need to provide the OS license. But colocating with other services is an option.
kt3zAuthor Commented:
I'm not sure all the Microsoft audit staff is aware of that.  But thanks the information is very useful.
timgreen7077Exchange EngineerCommented:
The MS staff isn't aware of a lot. Their O365 support is the worst i have ever seen. Don't tell them you are in a hybrid and you have an on-prem Exchange, they really are clueless.
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