AOL Mail, stylized as Aol Mail., is a free web-based email service provided by AOL (known until 2009 as "America Online").

The service is sometimes referred to as AIM Mail where "AIM" stands for AOL Instant Messenger.

iCloud is a cloud storage and cloud computing service from Apple Inc. launched on October 12, 2011., the service had 782 million users.

Gmail is a free, advertising-supported email service developed by Google.

Users can access Gmail on the web and through the mobile apps for Android and iOS, as well as through third-party programs that synchronize email content through POP or IMAP protocols.

Gmail started as a limited beta release on April 1, 2004.

It exited beta status on July 7, 2009.

Outlook.com is a web-based suite of webmail, contacts, tasks, and calendaring services from Microsoft.

One of the world's first webmail services, it was founded in 1996 as Hotmail (stylized as HoTMaiL) by Sabeer Bhatia and Jack Smith in Mountain View, California, and headquartered in Sunnyvale.

Microsoft acquired Hotmail in 1997 for an estimated $400 million and launched it as MSN Hotmail, later rebranded to Windows Live Hotmail as part of the Windows Live suite of products.

Microsoft released the final version of Hotmail in October 2011, available in 36 languages.

It was replaced by Outlook.com in 2013.

AT&T Internet Services (previously SBC Internet Services) is a trade name for several affiliated companies.

AT&T Internet Services provides the att.net consumer web portal and information service and the AT&T Yahoo! Internet service.