To import address books
You can import address book contacts from other Windows Address Book files (.wab), as well as from Netscape Communicator, Microsoft Exchange Personal Address Book, or any text (.csv) file.
For all other address book formats
On the File menu, point to Import, and then click Other Address Book. In Address Book Import Tool you are looking for Microsoft Exchange Personal Address Book.
Click the address book or file type you want to import, and then click Open.
This worked for me so I hope that it does for you!