Maintain NTFS Folder Permissions after Joining a new Domain

Our Company A is going to purchased by Company B.  Both of us are on Windows 2003 domains.  During the transition period, we will have a 2-way trust between both domains.  Eventually, all servers from Company A will join Company B's domain.  There will be new user accounts setup on Company B's domain.  Is there some type of utility out there that I can use to match up existing Comany A accounts with the new Company B accounts so I can maintain and copy the same NTFS permissions for users on files and folders after joining the new domain?
drivetechAsked:
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TechnicallyMaybeCommented:
You'll want to use the Active Directory Migration Tool to do what you need.
http://www.microsoft.com/downloads/details.aspx?FamilyID=20C0DB45-DB16-4D10-99F2-539B7277CCDB&displayLang=en

It is going to take some planning.  Here is the guide.
http://www.microsoft.com/downloads/en/confirmation.aspx?familyId=6d710919-1ba5-41ca-b2f3-c11bcb4857af&displayLang=en

Happy Migration!
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Windows Server 2003

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