You can import contact lists and address books that are saved in a comma-separated (.csv) text file format.
Go to Options>Address Book.
Click Browse to locate the .csv file to import.
Click Import. A list of your address books is displayed.
Select the address book to import into or create a new address book.
Click OK. Depending on the size of the .csv file, import may take a few minutes.
When Import is complete, the Status Box shows the number of contacts successfully imported.
Contacts are in alphabetized by last name.