Exch 2013 and 2007 coexistance, unable to login to OWA

I have a 2007 server and just installed a 2013 Exchange server.  Both sit on a 2008 R2.  After installing 2013, I created the new mailbox like the M guide stated.  When I go to OWA however it says that "A mailbox couldn't be found for NT AUTHORITY\SYSTEM."  I can however log in to ECP with the Admin account.
TexasJoshAsked:
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TexasJoshConnect With a Mentor Author Commented:
Had to break down and spend 8 hours on the phone with Microsoft Premier Support.  They resolved it but way too complex to recreate!
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TexasJoshAuthor Commented:
Been through that one over and over, thanks.  Found that the only way to log in to ECP was if the server itself was a member of the Org Mana group, but that only logs in to ECP as the NT AUTH/SYSTEM account. Once you remove the server from the OM group ou can't log in to OWA or ECP.  Tried rebuilding OWA and ECP virtual directories with no luck.
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florin_sCommented:
I have not encountered this untill now but it seems that recreating the virtual directories is the way to go here:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_28012501.html
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TexasJoshAuthor Commented:
Neither of these comments are the solution.  I have reset both virtual directories and have tried tcp ecp/ owa and owa/ urls but always endup with the "something went wrong" page and reference to NT AUTHORITY/SYSTEM account.
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florin_sCommented:
what caused it at least?
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TexasJoshAuthor Commented:
Had to break down and spend 8 hours on the phone with Microsoft Premier Support.  They resolved it but way too complex to recreate!
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