Non-breaking space is visible in message body in Outlook in Exchange Server 2019 and 2016

Symptoms

In Microsoft Exchange Server 2019 and Exchange Server 2016, when you open Microsoft Outlook in an online mode profile and drag a message from the Inbox to the Calendar folder or a task folder, you may notice that the Calendar or task object displays an unexpected "&nbsp" string in the empty line between the lines of the message text. For example,

Hello User001,

&nbsp

This is a test…

This issue also occurs in the Outlook on the web client (previously known as OWA).

Resolution

To fix this issue, install one of the following updates:

For Exchange Server 2019, install the Cumulative Update 8 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019.

For Exchange Server 2016, install the Cumulative Update 19 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016.

References

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