Exchange 2016 CU22 Upgrade KB2999226 isn't installed

Simon Pelsser 6

Hi,

I've a VM running Win 2012R2 and Exchange 2016 CU20.
I would like to upgrade to Exchange 2016 CU22.
Upgrade failed with this error : KB2999226 isn't installed on this computer and needs to be installed before Exchange Setup can begin.
But this KB is installed. I tried to uninstall the KB, reboot Windows, install the KB again, the error persists...

Any ideas would be very nice :)

Regards,

Simon

Kael Yao-MSFT 37,496 Reputation points Microsoft Vendor

2021-11-03T07:48:32.513+00:00
Hi Simom.

Did you use the install wizard to install CU22?
Please try with unattended mode instead (run the following command in Powershell) and see if the same error persists:

E:\setup.exe /IAcceptExchangeserverlicenseterms_DiagnosticDataOFF /mode:upgrade

If it shows the same error, please double confirm if the correct KB is installed.
Download Link(for windows server 2012 R2) : https://www.microsoft.com/en-us/download/details.aspx?id=49063
Simon Pelsser 6 Reputation points

2021-11-03T08:05:23.227+00:00

Hi,

Thanks for your answer.
I've the same error using the unattended mode.

And when i install the update again i've the message "Update for Windows KB29999226 is already installed on this computer."

Do you have other ideas ?

Thanks,

Simon
Kael Yao-MSFT 37,496 Reputation points Microsoft Vendor

2021-11-03T08:35:34.317+00:00

Hi,

Thanks for the update.
Sorry currently I have no idea on what the cause of this issue could be as I cannot reproduce it in my lab.

Would you please post some screenshots of the error message "KB2999226 isn't installed on this computer and needs to be installed before Exchange Setup can begin" and Installed Updates (KB29999226) in Control Panel?
Simon Pelsser 6 Reputation points

2021-11-03T08:45:48.44+00:00

Hello,

Screenshots :

Regards,

Simon
Kael Yao-MSFT 37,496 Reputation points Microsoft Vendor

2021-11-04T06:23:01.963+00:00

Thanks for the information.

To me this issue is really strange.
Would it be possible to first upgrade to CU21, then upgrade to CU22?
Kael Yao-MSFT 37,496 Reputation points Microsoft Vendor

2021-11-08T09:28:50.4+00:00

Hi @Simon Pelsser

I am writing here to confirm with you how thing going now?
Did the issue get resolved?

1 answer

Simon Pelsser 6 Reputation points

2021-11-08T09:36:01.27+00:00

Hi,

I upgrade to CU21 and it's working.
I don't upgrade to CU22 yet.

Thanks a lot.

Simon
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1 person found this answer helpful.
Kael Yao-MSFT 37,496 Reputation points Microsoft Vendor

2021-11-09T01:07:12.583+00:00

Thanks for the update!

I would suggest also installing the latest security update to protect your Exchange server.
Here is the link with more detailed information: Released: October 2021 Exchange Server Security Updates

If the issue has been resolved, please feel free to mark your reply as the answer to the question.
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