Review the list for duplicates. Create a new spreadsheet using Microsoft Office Excel or the spreadsheet application of your choice. Along the top row of data, put data field headers.

Bet you didn’t know Excel could do: graph paper, address labels, award certificates Excel does just as well as Word in creating and customizing these useful office supplies. Here's how.

If you have a list of email addresses in an Excel spreadsheet, you can import this into a Mac Address Book by converting the Excel file into a text-based Comma Separated Value file.