More than one discovery mailbox was found exchnage 2010-Urgent database not mounting

on my exchange 2010 i am not able to mount any database whenever i am mounting i get an error saying more than one discovery mailbox was found i am exchnage 2010 and 2013 both in my environment,please see the error below.

exchnage-2010.JPGexchnage-2010-1.JPG
SysguysAsked:
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Adam BrownConnect With a Mentor Sr Solutions ArchitectCommented:
You have two copies of the same AD object there. Delete one. Go to your users container or the Exchange Security Groups OU in ad, find the AD object that matches the GUID listed in that error, then delete it. Don't delete both, just delete one.
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SysguysAuthor Commented:
i can see only these three

exch2012-3.JPG
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