2 comments on ““Microsoft Lync 2010 MAPI COM Server” Credential popup appears repeatedly

  1. Dear Ramy , It is nice to see you here . Regarding what you suggest about enabling both Basic & NTLM authentication methods let me explain something , although IISAuthenticationMethod supports multiple values, mutliple values are not supported for clientAuthentication. If you set Basic+NTLM, it will be set to NTLM for Outlook Anywhere ( Outlook Anywhere configuration selection is made as radio button not as check boxes ] , and here come the case as even though it is more secure, recommended by Microsoft but it maynot work with firewalls that examine and modify traffic.So if you don't have a firewall that examines and modifies the traffic you can go directly and set your Outlook Anywhere authentication method to NTLM and this completely solves this issue , if not , you may go with what I proposed above.

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