Find a folder on your work machine that looks like this (you will have to be able to see hidden folders):
I seem to remember the location of the folder is different on Win2k and XP, but I may be wrong. Just copy those files and paste them over the ones on your home computer. This will replace whatever is on your home computer's Outlook Express with your work computer's Outlook Express. Folder structure is retained, but your account settings or any rules you may have setup will have to be input manually on your home machine.
If you have never opened Outlook Express on your home machine, you should do that and restart Windows before attempting to paste your work files onto your home machine.