It's a snap! Just install Microsoft Outlook (usually along with Office), and
then open up Microsoft Outlook.
It'll prompt you to chose if you want it to be your default mail handler.
Accept that.
Then it'll prompt you to do a first time set up. Deline that (cancel).
Then go to File > Import and Export. Choose "Import Internet Mail Account
Settings" and it'll guide you through importing your settings from Outlook
Express.
If you want to import your mail and address book from Express, just repeat
File > Import and Export, but choose "Import Internet Mail and Addresses"
Shawn