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If you went straight from 2013 to 2019 and there were no existing 2016 servers, then no, you can't now install 2016 servers into the AD Forest once you ran the 2019 PrepareAD step.
Rolling back from Exchange 2019 to 2016
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Birneder, Boris
2
Reputation points
Hello,
a customer of us has installed a new Exchange 2019 DAG Cluster in a existing Exchange 2013 DAG cluster environment.
While testing we saw that they use an important Tool which is not working together with Exchange 2019.
At the moment there are only test Mailboxes in the 2019 databases.
Is it possible to uninstall the Exchange 2019 Servers and afterwards install Exchange 2016 DAG Cluster?
In the installation process of the first Exchange 2019 server there was a warning, that it is not possible to install Exchange 2016 afterwards (but i can't rember exactly)
Thankyou in Advance and kind regards Boris
Exchange | Exchange Server | Management
3 answers
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Andy David - MVP 157.8K Reputation points MVP Volunteer Moderator2022-11-07T17:41:35.39+00:00 -
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LilyLi2-MSFT 1,981 Reputation points2022-11-08T07:19:23.917+00:00 Hi @Birneder, Boris ,
Are you directly from Exchange 2013 to 2019 bypassing 2016?
If so, then agree with Andy.Therefore, for "Is it possible to uninstall the Exchange 2019 Servers and afterwards install Exchange 2016 DAG Cluster?", I am sorry to tell you that this is not possible.
About rolling back from Exchange 2019 in an Exchange 2013 and Exchange 2019 co-existence environment, please refer to this article: Rolling back from Exchange 2019 - Microsoft Community Hub
In this article, to avoid more unknown issues, Exchange 2016 was not introduced, but migrated to Exchange Online.
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Birneder, Boris 2 Reputation points
2022-11-08T07:44:15.133+00:00 Hello,
just to be sure:
At the moment all productive mailboxes are still on the Exchange 2013 Cluster.
And there was no Exchange 2016 server installed before Exchange 2019I thought, that new Exchange 2019 attributes for the mailboxes will added after migration? And after that no rollback is possible.
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LilyLi2-MSFT 1,981 Reputation points
2022-11-11T09:48:14.887+00:00 Hi @Birneder, Boris ,
Thank you for your reply.
“I thought, that new Exchange 2019 attributes for the mailboxes will added after migration?”
Migrating mailboxes is where mailboxes are moved from one database to another without adding new mailbox attributes.There was no existing Exchange 2016 serve, so you cannot roll back.
If the answer is helpful, please click "Accept Answer". If you have extra questions about this answer, please click "Comment".
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LilyLi2-MSFT 1,981 Reputation points
2022-11-15T03:27:25.397+00:00 Hello,
I'm here to confirm with you if your issue has been resolved. If the problem is successfully solved, you can mark the helpful reply as answer, this will make answer searching in the forum easier and be beneficial to other community members as well.
Warm thanks.
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