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Noctis0791-8502 avatar image
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Noctis0791-8502 asked Noctis0791-8502 commented

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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office-exchange-server-administration
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AndyDavid avatar image
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AndyDavid answered Noctis0791-8502 commented

No, absolutely not. Upgrading will not affect any transport rule.
Those are stored in AD, not in the server config.

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Awesome! I read this article regarding latest CU update and it says customized IIS and Exchange Server configuration will be overwritten though the list of config files were not specified. Do you guys happen to know those configuration files being mentioned and their locations?

Thank you so much!

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AndyDavid avatar image AndyDavid Noctis0791-8502 ·

that refers to files such as:

https://docs.microsoft.com/en-us/exchange/clients/outlook-on-the-web/customize-outlook-on-the-web?view=exchserver-2019
and
%ExchangeInstallPath%Bin\EdgeTransport.exe.config


https://docs.microsoft.com/en-us/exchange/mail-flow/queues/relocate-queue-database?view=exchserver-2019

Honestly, most people do not change any of those settings. I would upgrade and not worry about it. :)

Note that not all customizations get overwritten either. The transport one will not get overwritten.

Its typically just an custom IIS setting and even if that is overwritten, its easy to fix and does not affect functionality.




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Hi AndyDavid,

Thank you so much for your help! Hearing these from an expert really boost my confidence in pushing this CU to our Exchange Server 2016. :)

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joyceshen-MSFT avatar image
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joyceshen-MSFT answered Noctis0791-8502 commented

Hi @Noctis0791-8502

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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Thanks as well joyceshen-MSFT.

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