How do I export public folder data from inactive exchange server?

I have migrated from SBS2003 (old) to SBS2008 (new)

Used migration wizard / answer etc...  All went well, expect for the public folders; which failed.

Question: How do I retrieve the public folder information from the OLD (inactive) server and import it to the NEW server?

The OLD server has been removed from the domain. I have backups of the OLD server and its original hard drive; where the public store info is located.

I tried PDDAVAdmin.exe; did not work for me.

All help is greatly appreciated.

Bill