Recently, we published guidance on how to enable Kerberos Authentication for Exchange 2013 MAPI clients. While this guidance explains the necessary steps to deploy the ASA credential to Exchange 2013, it does not describe what steps you must take to coexist in Exchange 2010 environment. There are certain steps you must take in order to deploy Kerberos authentication for Exchange 2013 and coexist with Exchange 2010.
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Until later,
Henrik Walther