is Universal C Runtime in Windows (KB 2999226) required for server 2016 exchange 2016 CU22 ?

Keith Hotchkiss 6 Reputation points
2021-12-28T23:32:56.233+00:00

is Universal C Runtime in Windows (KB 2999226) required for server 2016 exchange 2016 CU22 ?
Cumulative Update 22 for Exchange Server 2016 (KB5005333)
Notice

This September 2021 cumulative update (CU) will install Exchange Emergency Mitigation (EM) service. This service is designed to help secure your servers that are running Microsoft Exchange Server by applying mitigations to address any potential threats against them. It uses the cloud-based Office Config Service (OCS) to check for and download available mitigations and to send diagnostic data to Microsoft.

This CU has the following additional prerequisites:

IIS URL Rewrite Module

Note The app pools are restarted as a part of the IIS Rewrite module installation. Therefore, service might be disrupted.

Universal C Runtime in Windows (KB 2999226)

Exchange | Exchange Server | Management
Exchange | Exchange Server | Management

The administration and maintenance of Microsoft Exchange Server to ensure secure, reliable, and efficient email and collaboration services across an organization.

Windows for business | Windows Server | User experience | Other

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  1. Anonymous
    2022-04-28T15:45:43.403+00:00

    The Universal C runtime shows that it is for Window Server 2012 and earlier. What if you are running Exchange 2016 on Windows Server 2016. is it still needed?
    I do not see a download/update package for this runtime for Windows Server 2016.

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  2. Limitless Technology 40,111 Reputation points
    2021-12-30T11:31:42.867+00:00

    Hi @Keith Hotchkiss

    Thank you for your question and reaching out.

    I understand that you have query regarding KB dependency.

    Yes you are correct as per Microsoft KB documentation , KB5005333 has additional prerequisites which is Universal C Runtime in Windows (KB 2999226) and that it need be installed before installing of KB5005333 .

    Hope this answers your question :)
    Thank you.
    Prakash

    --If the reply is helpful, please Upvote and Accept as answer--

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  3. abbodi86 5,081 Reputation points
    2021-12-30T04:44:53.47+00:00

    UCRT is inbox component in Server 2016 and later
    KB2999226 not needed or apply

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  4. Anonymous
    2021-12-28T23:53:58.41+00:00

    Yes, looks like it
    https://support.microsoft.com/en-us/topic/cumulative-update-22-for-exchange-server-2016-kb5005333-ceb154d8-7116-43a5-83c1-205af7c43764

    --please don't forget to upvote and Accept as answer if the reply is helpful--

    161034-image.png

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