While Qualcomm also offers an older freeware release of Eudora called Eudora Light, there are now so many more features in the Pro version that most users will want to bypass the Light release from the beginning or will want to upgrade to the more powerful Pro client after using Eudora Light for any length of time.
Features exclusive to the Pro release include enhanced message filtering capabilities, multiple e-mail account support (who doesn't have more than one account these days?), an inline spelling checker, auto-completion support, auto redirection capabilities, a configurable toolbar, a customizable address book, HTML/stylized text support, UUencoding/decoding, multiple signatures, color-coded message labeling, return receipt capabilities, comprehensive documentation, free technical support for 90 days, and much more.
