Exchange 2010 Decommisioniing

We have below Exchange 2010 Setup :

CAS Servers - 2
MBX Server -2
Exchange - 1
DR - 2

Now as we have migrated to O365 with all the dependencies.
We want to de-commision the on-prem exchange server but also want to keep a single server for user attribute management.
What could be the best practise we need to follow so that things won't break.
Naveen JoshiAsked:
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Sandeep KumarAssociate ConsultantCommented:
To Decommissioning Exchange Server 2010, look into below blog for steps:
https://www.kerneldatarecovery.com/blog/decommissioning-exchange-server
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Naveen JoshiAuthor Commented:
Hi @Sandeep

Thanks for the response but my question was to decommission and keeping one exchange server live so that exchange user attributes can be modified in future in place of using adsiedit.msc.
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Amit KumarCommented:
Better you keep one server with multi role as keeping only one role will not help you. So CAS, MBX and HT all of them will be required.
2
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MAS (MVE)EE Solution GuideCommented:
Adding to the above.
-->CAS Servers - 2.
I guess this is HUB and CAS. Keep one server with HUB and CAS as it will make your administration easy.
And it is recommended by MS as well. If you keep mailbox and there is a chance for NDR after mailbox moved. Not all the cases though.

-->MBX Server -2
You can uninstall both mailbox servers after moving all mailboxes off the server.

-->DR - 2
You can uninstall this servers as well.

FYI
The schema update done when installing SP3 is irreversible. So even if you remove Exchange attributes still remains.
When directory synchronization is enabled for a tenant and a user is synchronized from on-premises, most of the attributes cannot be managed from Exchange Online and must be managed from on-premises. If you have directory synchronization in place without running the Hybrid Configuration Wizard, you still cannot manage most of the recipient tasks from the cloud.

You can request an Exchange Hybrid Server product key, with no additional costs if the following conditions apply.
  • .
You have an existing, non-trial,Office 365 Enterprise subscription
  • .
You currently do not have a licensed Exchange 2013 or Exchange 2010 SP3 server in your on-premises organization.
  • .
You will not host any on-premises mailboxes on the Exchange 2013 or Exchange 2010 SP3 server on which you apply the Hybrid Edition product key.


Please check this for more details
https://blogs.msdn.microsoft.com/vilath/2015/05/25/office-365-and-dirsync-why-should-you-have-at-least-one-exchange-server-on-premises/

Hope this helps
MAS
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Todd NelsonSystems EngineerCommented:
I would recommend the following high level tasks...

  1. Install Exchange 2016
  2. Acquire and apply Exchange 2016 hybrid product key from your O365 subscription (assuming you have an enterprise-level subscription)
  3. Configure for coexistence with Exchange 2016
  4. Update firewall rules as needed
  5. Decommission all Exchange 2010 servers
  6. Remove Exchange 2010 servers from domain
  7. Add IP addresses from Exchange 2010 servers to Exchange 2016
  8. Update internal DNS records as needed
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msidnamCommented:
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MAS (MVE)EE Solution GuideCommented:
Enough information to confirm answer.
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