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Can't use Outlook on the web to reply a partner email through mutual TLS in Exchange Server 2019 and 2016

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Symptoms

Assume that mutual TLS is configured between organization A and organization B in Microsoft Exchange Server 2019 or Exchange Server 2016. The user in organization A can't use Outlook on the web (formerly known as Outlook Web App) to reply the email message that's sent from anyone from organization B.

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Resolution

To fix this issue, install one of the following updates:
For Exchange Server 2019, install the Cumulative Update 2 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019.
For Exchange Server 2016, install the Cumulative Update 13 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016.

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Workaround

To work around this issue, you can use Outlook to reply the partner email messages in this situation.

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References

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

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Keywords: can't use OWA to reply a partner email via MTLS, kb, kbfix, kbqfe, kbHotfixAuto, CI101584

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Article Info
Article ID : 4502133
Revision : 9
Created on : 6/18/2019
Published on : 6/18/2019
Exists online : False
Views : 306