Jennifer Smith offered these thoughts for the group's
consideration of the matter at hand:

Do you want to also transfer all of your current XP settings such
as screen resolution, colors, icons, text, etc., your OE folders
and E-mail, or just the address book? If just the address book,
look for a file with the extension .wab and the name of the account
in front of the file. Each account has its own address book. If you
want to transfer everything, as I did when I got a new PC built but
the same O/S, then use the Files and Settings Transfer Wizard. The
Wizard is also a great backup tool.

Hello,

Additionally, you can open Outlook Express, Tools > Address Book > File >
Export > WAB.

Perform the same action on the other computer and Import the address book
you saved in the previous step.

WAB transfer to a different machine

WAB is the Windows Address Book.

I'm assuming that the two machines are *not* connect in any way.  Like a
network or a Direct Cable Connection.  Copy your Windows Address Book to a
floppy or CD.

Do a Search for *.wab
* is a wild card and will locate all wab files on your machine.
wab is the file extension for all Windows Address Books.
Mine is Wesley P_ Vogel.wab

Or Open Windows Address Book | Click Help | About Address Book |
Copy the path and paste it into the Start | Run box | Click OK

Typically located here >>
%appdata%\Microsoft\Address Book
or
%userprofile%\Application Data\Microsoft\Address Book
or
C:\Documents and Settings\Your Name Here\Application Data\Microsoft\Address
Book

Once your WAB is located right click it and select: Send To |
3½" Floppy (A:)  Make sure there's a disk in the floppy drive.

Stick the disk you copied the *.wab to in the XP machine's floppy drive and
copy it to:
C:\Documents and Settings\Your Name Here\Application Data\
Microsoft\Address Book

To open the floppy disk...
Start | Run | Type:    a:     | OK |
Right click your *.wab file and select: Copy

This will open the proper folder...
Start | Run | Type or paste the following:

%appdata%\Microsoft\Address Book\Microsoft\Address Book

Click OK or hit the ENTER key.

Right click the right hand pane and select: Paste

You should now see your *.wab file.

Where is my address book stored?
http://insideoe.tomsterdam.com/faqs/where.htm#findwab

The Windows Address Book (WAB)
http://insideoe.tomsterdam.com/files/wab.htm