One of the easiest ways to increase productivity is to use email filters (called "Message Rules" in MS Mail, Outlook, and Outlook Express). Filters allow you to sort incoming email into sub-folders, allowing your inbox to remain nice and tidy.

One of our favorite filters is to sort suspected spam into a folder to be reviewed later.  We've created a video tutorial to show you how this is done in MS Mail (the procedure is similar in Outlook and Outlook Express).