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Assume that you implement Microsoft Exchange Server 2016 in a Windows Server 2016 computer. When a user signs in the Outlook on the web client (previously known as Outlook Web App) or the Exchange admin center (EAC) for the first time, the user can select a culture language. If the user selects an invalid language that has an LCID value of 4096 such as English (Belgium), the Outlook on the web client or EAC crashes with a "System.Globalization.CultureNotFoundException" error message.

This issue prevents the user from signing in until you change the language setting back to a supported one.


This issue occurs because the newly-added cultures don't have valid LCIDs.


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.

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