Windows Live is an online application service platform launched by Microsoft. It provides users with personal website settings, email, VoIP, instant messaging, retrieval and other services through Microsoft servers and the Internet. It is an extension of Windows on the Internet.

Gmail (Google Mail) is a free email service under Google. It was released in 2004 as an invitation to register. It provided 1GB of storage space upon launch, far exceeding the mainstream Yahoo Mail, Hotmail, etc. at the time. Registration was fully open in 2007.

Inbox is a famous free email website, ranking fifth in the world. The website's single email attachment is limited to 20M (the client can support 50M attachments). In addition to common email functions, the website also provides free network hard drive services.

Hotmail is a free Internet email provider. It was established in the United States in 1995 by Jack Smith and Indian entrepreneur Shabir Bhatia. After being acquired by Microsoft at a high price in late 1997, it began to run entirely on the Windows platform. Later, it was merged with other Microsoft service platforms to become part of MSN and Windows Live; on May 2, 2013, Hotmail was upgraded to Outlook mailbox, marking the official end of Hotmail.