Removing Exchange 2007 and 2013 after O365 migration

hello EE community,

We were running Exchange 2007 and had stood up Exchange 2013 in parallel for our initial 2007 to 2013 migration. We were at the point where we were ready to migrate the mailboxes over to 2013. However, at the end we ended up going to Office 365 which we recently completed migration over to. We're running AD sync on our domain controllers for syncing the AD accounts/attributes. The on-premises (2007 & 2013) exchange servers have been powered down for couple of days and everything is still working as expected as far as emails goes. Now we need to decommission and cleanly remove them from our environment. Could someone be kind enough to provide me step by step process of properly removing both verison of exchange?
Michael McGovernVP of Information TechnologyAsked:
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viktor grantExchange ServersCommented:
Hi Michael,

In order to remove Exchange correctly. You need to uninstall Exchange from "Program and features", you need to uninstall Exchange.

Check the following link: https://www.netwoven.com/2017/04/13/decommission-exchange-server-2013-2/

Cheers
Viktor
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Todd NelsonSystems EngineerCommented:
If you are going to maintain directory synchronization, MS does not recommend or support removing all on premises Exchange servers.  They recommend leaving at least one for management.

If you remove all on premises Exchange servers without disabling directory synchronization, then there are many attributes that you will not be able to manage in O365/EXO.
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Michael McGovernVP of Information TechnologyAuthor Commented:
Thanks Victor & Todd for the response.

@ Todd - So we're kind of managing it with limited access via 3rd party applications (ie, Cloudportal Service Manager and Novulex). We had migrated to our parents company O365 tenants and they provided us these tools for management. All that was asked of us was to install the ADSync application on our DCs to sync the AD accounts. In this senerio, could we completely remove the on premises Exchange server without any issues?
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Todd NelsonSystems EngineerCommented:
In theory but not supported with directory sync enabled.
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Sandeep KumarAssociate ConsultantCommented:
Go through https://www.kerneldatarecovery.com/blog/decommissioning-exchange-server for steps to follow for clean-up and Decommissioning Exchange Server 2007.
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Michael McGovernVP of Information TechnologyAuthor Commented:
We we able to successfully decommission both 2013/2007 successfully without any issues.
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