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How to uninstall MS Exchange Server 2010
Hi, the supported methodology in this situation is to retain a single Exchange on-premises server in the environment to manage attributes where the SOA is on-prem, and provide SMTP relay services.
If you have Office 365 Enterprise licences then you qualify for a free Exchange 2016 hybrid licence key. So you could install Exchange 2016 into your environment, run the hybrid config wizard, move arbitration and discovery mailboxes to to Exchange 2016, also create an SMTP mail relay connector.
Then you can decommission your Exchange 2010 servers by uninstalling Exchange via the Control Panel
In addition to PeterRising recommendation see the following articles providing more details:
Office 365 and Dirsync: Why should you have at least one Exchange Server on-premises
https://blogs.msdn.microsoft.com/vilath/2015/05/25/office-365-and-dirsync-why-should-you-have-at-least-one-exchange-server-on-premises/
How and when to decommission your on-premises Exchange servers in a hybrid deployment
https://technet.microsoft.com/en-us/library/dn931280(v=exchg.150).aspx
Decommissioning your Exchange 2010 servers in a Hybrid Deployment
https://blogs.technet.microsoft.com/exchange/2012/12/05/decommissioning-your-exchange-2010-servers-in-a-hybrid-deployment/
VickVega Decommissioning your Exchange 2010 servers in a Hybrid Deployment
Above link not working and looking for the steps?
aussupport
Here is the updated link. Since Microsoft changed platform, those articles can be found by plugging the title of the article in search. It should get you to the updated location.
