Authentication with Exchange Server
Supported on: At least Windows Server 2008 R2 or Windows 7
Registry
software\policies\microsoft\office\16.0\outlook\security Options
authenticationservice enum - Kerberos/NTLM Password Authentication
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9 - Kerberos Password Authentication
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16 - NTLM Password Authentication
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10 - Insert a smart card
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2147545088
Description
This policy setting controls which authentication method Outlook uses to authenticate with Microsoft Exchange Server. Note - Exchange Server supports the Kerberos authentication protocol and NTLM for authentication. The Kerberos protocol is the more secure authentication method and is supported on Windows 2000 Server and later versions. NTLM authentication is supported in pre-Windows 2000 environments. If you enable this policy setting, you can choose from three different options for controlling how Outlook authenticates with Microsoft Exchange Server: - Kerberos/NTLM password authentication. Outlook attempts to authenticate using the Kerberos authentication protocol. If this attempt fails, Outlook attempts to authenticate using NTLM. This option is the default configuration. - Kerberos password authentication. Outlook attempts to authenticate using the Kerberos protocol only. - NTLM password authentication. Outlook attempts to authenticate using NTLM only. If you disable or do not configure this policy setting, Outlook will attempt to authenticate using the Kerberos authentication protocol. If it cannot (because no Windows 2000 or later domain controllers are available), it will authenticate using NTLM.