Use this tag ONLY for Microsoft's FREE PERSONAL webmail service Outlook.com.

Outlook.com, formerly Hotmail, is a free personal email service offered by Microsoft. It includes a webmail interface featuring mail, calendaring, contacts, and tasks services. Outlook.com can also be accessed via email clients using the IMAP or POP protocols.

Outlook.com is offered with all Microsoft accounts, and email addresses are offered ending with @outlook.com and @hotmail.com, but also @msn.com, @live.com, @passport.com, and other domains depending on when and where the account was created.

Wikipedia > Outlook.com