Exchange 2007 to 2013 Issue

I am migrating a client from Exchange 2007 to Exchange 2013.  I have everything setup to Coexist.  I have move a few test mailboxes over from Exchange 2007 to Exchange 2013.  When I open Outlook I am continually prompted for the username and password.  I have tracked this down to the public folder still located on the Old Exchange 2007 machine.  Does anyone know how to resolve this where the public folder can exist on the Exchange 2007 machine while we are migrating mailboxes.

Thanks for your help
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Jcook4130Author Commented:
Just wanted to post that I was able to figure this out.  My Exch 2007 box was set to IISauthentication of basic only

get-outlookanywhere -Server "NameofExch2007server" | set-outlookanywhere -IISauthentication basic,Ntlm


Then everything worked correctly

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