Outlook client can't update the "Read/Unread" icon after installed Exchange latest patch

Eric Lao 10 Reputation points
2024-03-19T08:50:17.2033333+00:00

We have Exchange 2016 CU23(On Windows server 2012R2) installed latest Exchange SU patch( Exchange Server 2016 CU23 Mar24SU), all of hosting mailbox database mailbox Outlook client can't update the mail "Read/Unread" status icon to "Read" even if users clicked the mail or manual change the status to "Read". And we found this issue is only happening when the user received the internal email from Exchange, external email no such issue.

This issue is only occurring on patched Exchange server that we are having 4 x Exchange servers in GAD, and now we stopped the further patching to another Exchange servers.

I also checked the KB, but it seems didn't mention this is a known bug. Please advise.

https://support.microsoft.com/en-us/topic/description-of-security-update-12-for-exchange-server-2016-march-12-2024-kb5036386-60a770fb-88da-4e46-b51c-1448dd8f8d1d

Also, I realized a lot of users have same issue that was reported on MS community.

https://techcommunity.microsoft.com/t5/exchange-team-blog/released-march-2024-exchange-server-security-updates/ba-p/4075348/page/3#comments

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. ChristyZhang-MSFT 20,826 Reputation points Microsoft Vendor
    2024-03-20T02:11:57.43+00:00

    Hi @Eric Lao ,

    Welcome to our forum!

    As i know, Microsoft has taken note of this issue and is investigating it. Please be patient, and I'll let you know if there is any update on this issue. Thanks for your kindly understanding and support!

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