If you have still not leaped on to Linux and Mac then there’s a possibility that you are pissed off with the the Outlook Express whenever you want to send a message to mail client. Outlook made better sense in older days when you had to have some email client to send mails.
The users now like to send mails through gmail or some other email service. You can of course edit in registry so that Outlook doesn’t pop up every time you send mails but help is at hand if you are not geeky or brave enough to mess with registry.