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This new Windows 10 Mail app, which comes pre installed along with Calendar, is actually part of the free version of Microsoft's Office Mobile productivity suite. It's called Outlook Mail on Windows 10 Mobile running on smartphones and Tablets, but just plain Mail on Windows 10 for PCs.

Yes, you can buy standalone Outlook 2016 from MS. Note, it will NOT fully integrate with Home and Student as well as it would if it was part of the 2016 Home and Business or 365 Personal or Home Office bundles.

Outlook.com is the current name for Microsoft's email service, the artist formerly known as Hotmail.com. Outlook on the web, or OWA, is the Outlook web app that lets you browse your Outlook.com email account. It's part of the brand's suite of Microsoft email web apps. Outlook Mail is Microsoft's desktop email client.

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note taking, journal, and web browsing.

The MS Exchange is a software that operates on the server. Whereas, the Microsoft Outlook is the desktop email client. Using an Outlook, users can retrieve their emails from their Exchange Server. In order to do so, the POP is used.