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From within OE, click File/Import. You have choices for Address Book, Messages, etc.
Choose Messages (can't do both at once), follow the wizard's prompts, navigating to the folder in which you stored the dbx files.
Repeat for Address Book if you were able to save it as well. If not, you can just right click on messages and choose "Add Sender to Address Book" to recover at least some of your contact list.