Foreign security principal OU in AD

Hi there,
I have single domain windows server 2008 R2 and no connection to any foreign domain.
Since I had upgraded my domain from 2008 x32 to server 2008 R2.  Also I have installed and upgaded my exchange from 2003 to exchange 2010.  Under my AD in Foreign security principal OU i have started to see these Users:
S-1-5-11   Foreign security principal      NT Aut\Authenticated users
----              ---------                                     NT Auth\IUSR
_____            _______                                     NT Aut\SYSTEM
--------          -----------                                    NT Auth\Local Service
----------        -------------                                 NT Auth\Network Service
-------------    -----------                                   NT Auth\Interactive
-------------     -------------                                 NT Auth\Ent domain controllers
I just checked it and had no idea if my domain upgrade has done it or excahnge upgrade has done it?   Need help please, what should I do and where should these users go ? what are default users for ou 'Foreign security principals'  am I in trouble?
Help
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amanzoorNetwork infrastructure AdminAsked:
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imkotteesConnect With a Mentor Senior Messaging EngineerCommented:
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