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In this scenario, the Require SSL setting will be turned on. However, it's expected that the MAPI virtual directory maintain the settings. In addition, the other virtual directories don't have this issue.
To resolve this issue, install Cumulative Update 11 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Learn about the terminology that Microsoft uses to describe software updates.
Keywords: after installing a cumulative update of Exchange Server 2016, Require SSL setting of MAPI virtual directory is reset, kbexpertiseadvanced, kbqfe, kbsurveynew, kbfix, kb, CI87413, kbContentAuto