Exchange 2013 Users cannot access Public folder in Exchange 2007 SP3

Dears,

i am working in Upgrading Exchange 2007 to Exchange 2013 CU7,, I came to know with CU7 we have new way for coexistence with legacy Public Folder  https://technet.microsoft.com/en-us/library/dn690134(v=exchg.150).aspx

i did the steps exactly as it is in the article,  but now users in Exchange 2013 always prompt for username /password when opening outlook and i found they still trying to connect to Exchange 2007 PF Server using HTTPS and failed..

BTW, Outlook anywhere is disabled in EX2007 and as per this article Q/A , it is no more needed http://blogs.technet.com/b/exchange/archive/2014/11/07/on-premises-legacy-public-folder-coexistence-for-exchange-2013-cumulative-update-7-and-beyond.aspx

the issue now, still users getting prompted and cannot connect to PF in EX2007,,

your help is appreciated

thanks

Mufleh