No, absolutely not. Upgrading will not affect any transport rule.
Those are stored in AD, not in the server config.
Will CU override mail flow rules?
Hi Everyone,
We have some Mail Flow Rules configured on our Local Exchange 2016 Server. Will CU 20 override these customizations? Please advise.
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Andy David - MVP 142.2K Reputation points MVP
2021-03-29T22:04:25.617+00:00
1 additional answer
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Joyce Shen - MSFT 16,646 Reputation points
2021-03-30T06:06:45.093+00:00 Hi @Noctis0791
Agree with the reply above from Andy, mailflow rules will not be override after updating CU.
And if you have customised the files list above, it's better to backup and reconfigure them after the update.
Below threads discussed the similar issue for your reference:
IIS, Default website, Exchange and our company website
Exchange Server 2016 CU11 install
Installing exchange CU precautions and effects on custom configuration
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