It is a known fact that the majority of e-mail clients are using Microsoft Outlook. For the most part, Microsoft Outlook will function great and do almost everything you need it to 
do. It is rich with customizable settings and most PC users are comfortable with the interface. For some business customers, it is often set up using Exchange Server. Many folks do not know the mechanics of the system and the fact that Outlook uses a very proprietary file type to save your information.
