The Address Book in Windows XP was called user name.wab. This was used in the default Outlook Express email program. You can copy/move that .wab file to the Windows 7 system.
In Windows 7, open Windows Explorer and navigate to the C:\Users\your name\Contacts folder.
On the Toolbar, click the Import button.
In the Import dialog, select the Windows Address Book (Outlook Express contacts) option.
Click the Import button and navigate to where you saved the
.WAB file.
Select that file and click Open.
This will place all of the email addresses into the Contacts folder. This folder will be used for any email programs that you install.