Outlook.com (not to be confused with the Outlook program from the Microsoft Office suite) is a free web-based email service offered by Microsoft. It is the most widely used email service in the world with over 360 million users. Similar e-mail services are Yahoo! Mail and Gmail. The predecessor of Outlook.com was Microsoft Hotmail (previously also known as Windows Live Hotmail and MSN Hotmail). Since July 31 2012, users who still work with Hotmail could choose to switch to Outlook.com. By the summer of 2013 everyone is transferred. Hotmail has since then ceased to exist.