There are some free webmail services that are considered popular (on the basis of the numbers of people who use them). In this context, we will refer to the webmail services with more than 100 million users as the popular ones. Those are Gmail (Gmail.com), Hotmail and Yahoo Mail. AOL Mail may also get into this list, if we alter the rules a bit. These popular webmail systems co-exist with less popular ones, like iCloud Mail, My Way Mail, Inbox.com and Shortmail. Further analysis reveals that the more popular free webmail services share several features.
The first feature we tend to see in all of the popular webmail systems is unlimited storage, which is availed to all users. The less popular webmail systems on the other hand tend to offer very limited storage.
The second feature we tend to see in all of the popular webmail services is superb spam protection. The less popular webmail services tend to have less than impressive spam protection.
And the third feature we tend to see in all of the popular webmail services is superb graphic design, which translates into user-friendly interfaces. The less popular free webmail services on the other hand tend to be characterized by poor graphic design, which often translates into drab user interfaces.