outlook, exchange, NTLM Authentication

while connecting to outlook 2013 we hve exchange 2010

do we do Kerberos or NTLM Authentication

connecting from inside office  or through OA
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timgreen7077Exchange EngineerCommented:
use NTLM
pramod1Author Commented:
any reason if I am asked ? why not use kerberos
timgreen7077Exchange EngineerCommented:
Outlook attempts to authenticate using the Kerberos authentication protocol for internal clients by default i believe. If this attempt fails, Outlook attempts to authenticate using NTLM. When setting outlook anywhere on Exchange your external clients will authenticate via NTLM or Basic with NTLM being the more secure. There is no option when setting up outlook anywhere in Exchange for Kerberos, only NTLM, Basic and Negotiate.

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markgamacheAD and PKI NinjaCommented:
Even if you could setup Kerberos, you don't want to .  It would require that you put your DCs on the internet. At least U88 and T88 and your AD DNS.
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