SharePoint - Copy Permissions

We are migrating our SharePoint farm and users (about 4,000) from one domain to another.  During the transition, it is a requirement that the users have access to their sites from either their old, DomainA accounts or their new DomainB accounts.  If we didn't have that requriement, I'd just do a STSADM MIGRATEUSER command for each user.  But doing so will remove their DomainA permissions.

How do I do a farm-wide copy of a users permissions from an old to a new acount, at the site, list and file level, and there SharePoint group memberships?

Thanks,

Don B
donq1Asked:
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Sector5Commented:
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donq1Author Commented:
No, Metalogix is way too expensive for this one-off project.  I was looking for an STSADM command, or a SQL job I could run against the databases.  Something OOTB.
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MidabijeCommented:
Please tell me how this is an accepted solution ?  Seems like the problem is still open ?
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