OETool

OETool is an enhancement of Outlook Express that provides an additional Toolbar on the Views Toolbar (Note that the Views Toolbar has to be enabled via View | Layout and checking the Views Bar checkbox).
The program has been tested in Win98, Win2000, WinXP, and Windows Server 2003. Some features only work if IE6SP1 or WinXPSP1 are installed.

http://www.oehelp.com/OETool/

Grand Dad

OEBackup -- Program to backup OE data and settings (by Majik) - Free
Quick overview of features:

Complete Backup and Restore with just one button (each - ok, so it's two buttons)
Quick backup of current selected Identity.

Scroll down page for file downloads.

WMUtil - Free
WMUtil is a small utility to allow users to compact and repair the Windows Mail database in Windows Vista.

http://www.oehelp.com/WMUtil/Default.aspx