http://www.support.microsoft.com/?kbid=270670
OLEXP: How to Back Up and Recover Outlook Express Data
http://support.microsoft.com/default.aspx?scid=kb;EN-US;276511
OLEXP: How to Backup and Restore Outlook Express Blocked Senders List and
Other Mail Rules
Locate the .dbx files that contains your email - find storage location by
choosing Tools, Options, Maintenance tab and check the Store Folder entry.
Copy and paste this address into your Start, Run dialog to open it, then
copy the files to a backup disk.
The Address Book - Select File, Export
Choose Text File (Comma Separated Values) as the export option, as this can
be easily be imported into Outlook Express and any standard database
software.
The setup information for each of your email and news accounts must also be
exported; you do this through the Tools, Accounts dialog - select the
account and click Export to save the data in an .iaf file format.
If you prefer:
http://www.oehelp.com/OEBackup/Default.aspx
This is a simple program to back up the following:
Address Book files (.wab)
DBX files (Outlook Express 5.0 and greater)
Registry Entries:
Address Book
All Identities