Exchange 2010 ambiguous URL'S issue while coexist with exchange 2013

Hi ,
Please correct me if i am wrong and also all of you tell me your valuable suggestions.
Like as said in the below article we are having an exchange 2010 ambiguous url's in place.
Referred
article : 
http://blogs.technet.com/b/exchange/archive/2013/05/23/ambiguous-urls-and-their-effect-on-exchange-2010-to-exchange-2013-migrations.aspx
As said in this article, if we have exchange 2010 ambiguous url's in place we will face issues during exchange 2013 coexistence.I agree with that point .
Question : On such case why don't we use a separate namespace for internal and external outlook anywhere settings in exchange 2013 which is different from cas array name and also there is no need to disturb the existing exchange 2010
environment by changing the rpc client access attribute in exchange 2010 databases or by forcing the exchange 2010 internal outlook clients to connect via OA. Please clarify my doubt and say whether the mentioned scenario is possible or not ?
Note : Same time please consider the new namespace which is going to be utilized on exchange 2013 outlook anywhere settings is available on SAN certificate.
Regards
S.Nithyanandham

Hi ,
Please someone shed light on this case.
Regards
S.Nithyanandham
Thanks & Regards S.Nithyanandham

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    Thanks S.Nithyanandham

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