Symptoms

You can't search an email by using a special keyword "TMM" if it comes with a special pattern ("Number TMM-Char") in Microsoft Exchange Server 2019.

For example:

Jan 20 TMM-HRA

12344 TMM-CHH

Resolution

To fix this issue, install the Cumulative Update 9 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019.

References

Learn about the terminology that Microsoft uses to describe software updates.

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