The Gmail interface makes Gmail unique amongst webmail systems for several reasons. Most evident to users are its search-oriented features and means of managing e-mail in a "conversation view" that is similar to an Internet forum.
Read more about Gmail Interface: Programming, Organization, Contacts, Composition, Security, Addresses, Mail Fetcher, Product Integration, Browser Support, Language Support, Applications, Google Apps Provider Branding, Themes, Changes in Interface, Criticisms, See Also