EMAIL ICON AND FILE

Hello,
my microsoft email icon...........which used to be on the task bar is missing: with clicking on the icon in the task bar i was able to get into my in box immediately, check emails and go about my business..........

however since last week the email icon is lost (yellow in color) in its place is a blue clor envelope - outlook express!

this is not was i want.......... can u help me get my microsoft icon and features back............


thanks