Since your ESEUTIL exercise failed, there's a chance that these tools may not be able to read your database either. If that's the case, and if you really need the mail, then you're left with having to take the database into a forensic recovery company to see if they can get the data out. That's typically pretty pricey, but it may be your only option.
He could try Ontrack Data Recovery's PowerControls software. There is a free trial version that will let him know if it is recoverable.
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