The title should tell you that this is a very niche book, but it may not prepare you for the very very specific system inside. For those who live in outlook, Michael Linenberger provides a highly-structured system for managing the neverending flood of incoming tasks disguised as emails. Once set up, the system auto-focuses on items that you need to do today specifically and this week in general, while those items that are 'over the near horizon' get hidden from the list. But don't worry, they are still there, and they will pop up on the list at a more appropriate time.
The only problem with this system is that it is extremely outlook-customized-specific, and none of the rules will traverse SMTP or POP. So if you have just one outlook running, this will work great. If you are syncing your email to multiple computers, (and your non-outlook phone) the system breaks down.
This aside, there are many good tips, tactics and outlook wisdoms here. Info on time-management, delegating tasks effectively and more. Highly recommended for those with a primary outlook inbox.