The following instructions explain how to export from Outlook and Outlook Express in general. There may be slight variations depending on which version you are using.
To export from Outlook:
Open Outlook.
Go to the File menu and choose Import/Export.
Select Export to a file and click Next.
Then, choose the type: Comma Separated Values (Windows) and click Next.
Select the folder to export from: Contacts and click Next.
Type a name for the file and click Next.
Make sure "Export contacts from folder: Contacts" is checked.
Click Finish.
To export from Outlook Express:
Open Outlook Express.
Go to the File menu and choose Export > Address Book.
Select Text File (Comma Separated Values).
Click Export.
Type a name for the file and click Next.
In the next window, select the fields you want to export and click Finish.