I believe that you can find which file extension that you already have in use for the address book in Mozilla by going to the search function on the start menu and type in address star dot star : address*.* or you can open the old Mozilla and export it to the desktop if you don't want to search for it. It's a good time to make a back up copy. . . You can export a Mozilla address book to import it into another user profile, move it to another computer, or use it with another program that can import address books. You can export an address book to one of these file formats: Communicator 4.x or Mozilla (.ldif), tab-delimited (.tab), comma-separated (.csv), or text (.txt) formats. To export an address book, begin from the Address Book window: 1. Select the address book that you want to export. 2. Open the File menu, and choose Export. 3. In the Export Address Book dialog box, browse to the location where you want to save the address book file. 4. Choose the file format for the exported address book (.ldif, comma-separated, or tab-delimited). 5. Enter a name for the address book file. Be sure to include the appropriate file extension (.ldif, .csv, .tab, or .txt). 6. Click Save. To unsub or change your email settings: //www.freelists.org/webpage/pctechtalk To access our Archives: http://groups.yahoo.com/group/PCTechTalk/messages/ //www.freelists.org/archives/pctechtalk/ For more info: //www.freelists.org/cgi-bin/list?list_id=pctechtalk