The easiest way to do it, is to go to your Outlook Express, go to Tools open options and choose the tab at the top called Maintenance.
You will see a folder in there in a box called message store. Copy and paste that, then do a search for it.
When you find the folder, copy and paste it to a location such as your documents folder, or once you get the location which is where Salman was talking about, you can copy it to a CD or another location.
Then on your new computer, open outlook express, and choose file and import messages. Choose OE 6 and follow the instructions, and browse to the location of your email folder that you copied.
To do the address book, you want to export it first either as .wab or csv and then import it the same way...