Removing On-Premises Exchange Servers after Migrating to Office 365.AD sync

Hi,
After hybrid migration and moving all mailboxes to office 365 it is not possible removing On-Premises Exchange Servers?Right?
https://practical365.com/exchange-server/removing-premises-exchange-servers-migrating-office-365/
Its not possible because of AD synchroinization?
What are the others possibilities?Migrate AD into Azure?
Is it possible migrate AD on Azure?
Or we need to wait for Microsoft solution
https://practical365.com/blog/microsoft-working-solutions-remove-premises-exchange-server-requirements/
LVL 1
Andy MladAsked:
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Vasil Michev (MVP)Commented:
Possible? It is. Recommended or supported? No.

The reason being that the *only* *supported* way to manage Exchange-related objects and their properties are the Exchange tools. If you are OK with having to manage them via unsupported tools, such as ADUC/PowerShell, and the risks this involve, no one can force you not to remove the last Exchange server in your organization. But Microsoft can deny you support in case you run into some issue related to that. I've worked with many organization that choose to go this route regardless, even though keeping a VM around with basic Exchange installation is not that costly anyway.
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AmitIT ArchitectCommented:
If your target is or was hybrid. Then you need Exchange server on-premises. If you want to move 100% to cloud. Then, You need to invest money in AD Premium version from MS, which is paid one. By default you get free ID in cloud. I advise you to talk to Microsoft. How you can do 100% move. You might need ADFS on-prem.
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Mark BillExchange, AD, SQL, VMware, HPE, 3PAR, FUD, Anti MS Tekhnet, Pro EE, #1Commented:
Nice posts guys.
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