Actually, as posted by jimbo45 some time ago..............
As long as you have a Vista machine, you can copy the contents of the C:\program Files\Windows Mail directory from the Vista machine and replace the files in the C:\Program Files\Windows Mail directory in Windows 7.
You'll need a program called Link Removed to delete the files on the Windows 7 machine.
Otherwise I'd recommend the open source Link Removed e-mail client