Microsoft has released Security Updates (SUs) for vulnerabilities found in:
Exchange Server Subscription Edition (SE)
Exchange Server 2019
Exchange Server 2016
SUs are available for the f...
Updated Sep 24, 2026
Version 4.0
Blog Post
I think we're also experiencing the issue where the search in Outlook/OWA isn't finding recent emails. We didn't notice it right away because we still had the old workaround (https://support.microsoft.com/en-us/topic/incomplete-search-results-after-installing-an-exchange-server-2019-update-96ae2ef0-4569-4327-8d0c-8a3c1abdc1f6) in place.
However, it takes a very long time for new emails to be indexed.
Yesterday morning, I received an email that I couldn’t find using the search function. I triggered the retry for my mailbox, but it wasn’t processed until late at night. This morning, I was finally able to find the email using the search function.
We are running Windows Server 2019, so updating .net framework ist not an option for us.
May I ask is this Outlook search issue affecting mailboxes hosted onprem only or is it also affecting Exchange Online mailboxes in hybrid Exchange environments?