You can easily create an icon on your desktop that allows you to compose and sand a mail by double clicking on it without opening Outlook Express.
1- Find a free space on your desktop and right click on it on New -> Shortcut
2- Enter in the space 'mailto:' (w/out quotes)
3- Press 'Next' button.
4- Enter in the space a name for the icon (i use 'mail')
5- Click 'finish'.