- Microsoft Exchange Server 2016 Cumulative Update 7 (CU7) is installed on a computer that's running Windows Server 2016.
- A user signs in Outlook on the web (Outlook Web App) and tries to change the language through:
OWA > Options > General > Region and time zone settings.
The user selects the language that has an LCID value of 4096, for example, English Belgium.
In this scenario, the user receives a "something went wrong" error message and OWA crashes. This issue prevents the user signing in until the administrator changes the language setting back to a supported one. In addition, you may find the following event logs are recorded:
Exception type: System.Globalization.CultureNotFound
Exception Exception message: Culture isn't supported. Parameter name: culture 4096 (0x1000) is an invalid culture identifier.