[squid-users] Risks by raising Active Directory Functional Level to 2008 R2

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Hi, 
 
I have installed RHEL 5.5 with Stable Version of Squid and integrated with 
Active Directory for user based authentication. Now we have to plan to raise 
our active directory functional level to 2008. What might be the risks on users 
based authentication while upgrading active directory. Early response will be 
appreciated.
 
 
Regards,
Sarfraz