Sharing the Outlook Express Address Book in Windows XP
While logged on to the user’s desktop that has the address book you want to use: Click Start, Run and enter REGEDIT:
Navigate to HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4\Wab File Name
Note the path to the WAB file in the (Default) entry. Log into the other desktop and open REGEDIT there. Navigate down to the same location as above. Double click the entry for (Default) and make it match the entry for the first user.

How to Share OE over Multiple Operating Systems
Start in Win98, open OE and use tools/options/maintenance to move the OE store folder to a share drive (*Note*, this drive must use the same drive letter in both OS’s, while Win98 will not allow you to reletter drives, WinXP will, so plan accordingly).
Once you have it moved to a “share” drive, click Start, Run and enter REGEDIT. Navigate to each of these keys and do a file/export of the key to the share drive (call each whatever you wish):
HKEY_CURRENT_USER\Identities
HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager
HKEY_CURRENT_USER\Software\Microsoft\Outlook Express
For …

How to Share OE (Mail/News/Address Book) between Users in Windows XP
If you don’t mind having Signatures, Rules and all the other settings the same, this method works.
From the user account that is already set up: Click Start, Run and enter REGEDIT
Locate the following 4 branches of the Registry
HKEY_CURRENT_USER\Identities
HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager
HKEY_CURRENT_USER\Software\Microsoft\Outlook Express
HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4\Wab File Name
Right click on each branch above and select Export and save the REG files to your hard drive.
For each account you want to have the same mail settings, log into that account. Click Start, Run and enter REGEDIT. …

Backup and Restore Your Outlook express
1) In Outlook Express, go to Tools, Options, Maintenance. Select the Store Folder button. Change the location of the OE Mail and News store folder to a drive/partition/folder that will not be affected by the uninstall or re-install. This is especially true if you plan to reformat the system drive. You will be prompted to log off/back on, or reboot, do so. For a small utility that will locate, and optionally open your mail store folder, click here (Find and Open the OE Mail Store)
2) …