In Exchange 2010 when you running in coexistence with a newer version, you might encounter the following error logged in the event log constantly:

Exchange 2010/2016:- coexistence errors
Exchange 2010/2016:- Coexistence errors 1

This error is logged because the CAS server does not have its correct URL’s set, you can refer to the link below for guidance on how to update them.

Once updated you and the server rebooted, the error above should stop logging.

Hope it helps.

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