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troubleshooting Question

Help, adprep /forestperp sdprep /domain prep screwed up my domain permissions

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I am upgraded a Windows server 2003 domain, and exchange 2007 box to small business server 2008.  I started by running adprep /forestprep and /domainprep from the 2008 cd on the 2003 DC.  Shortly after that users noticed they couldn't log into their emails.  Outlook just keep giving a credentials prompt and nothing would work.  They can't log into owa either.  Also a shared drive is inaccessible with their domain credentials.  But they can still log into the workstations.  The only backup we have is from august which is of no help.  I NEED HELP!  one funny thing is the Admin account i used during this process is the only one that still functions normally?!?

Please help, need urgent response
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