David,
Email presents a challenge to a lot of people who have taken this course. We leave it open all day and then try to respond immediately when we get something. While to person we are responding to may be pleased, we may be reducing our productivity as we stop and start tasks.
I have found that I have to turn Outlook off while I am working on something else. I check it every 90 minutes or so.
Youmay have to train those that work with you that just because they sent it a few minutes ago, you may not have read it yet. I often get questions like "Did you read my email?" when I am eating lunch and when I ask when they sent it, it is often five minutes ago.