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Microsoft Mail Server was eventually replaced by Microsoft Exchange; Microsoft Mail Client, Microsoft Exchange Client, and Schedule+ were eventually replaced by Outlook (Windows and Mac). Server Architecture. Microsoft Mail was a shared-file mail system; the "postoffice" was a passive database of files which could reside on any file server.
Outlook.com is a webmail service that is part of the Microsoft 365 product family. It offers mail, calendaring, contacts, and tasks services. Founded in 1996 by Sabeer Bhatia and Jack Smith as Hotmail, it was acquired by Microsoft in 1997 for an estimated $400 million and relaunched as MSN Hotmail, later rebranded to Windows Live Hotmail as part of the Windows Live suite of products.
Gmail is a free email service provided by Google.As of 2019, it had 1.5 billion active users worldwide. A user typically accesses Gmail in a web browser or the official mobile app.
Microsoft Outlook is a personal information manager software system from Microsoft, available as a part of the Microsoft Office suite. Though primarily an email client, Outlook also includes such functions as calendaring, task managing, contact managing, note-taking, journal logging and web browsing.
browser login Compuserve ... As of October 2016, email clients supporting SMTPUTF8 included Outlook 2016, mail for iOS, and mail for Android. 
In computing, the Internet Message Access Protocol (IMAP) is an Internet standard protocol used by email clients to retrieve email messages from a mail server over a TCP/IP connection.
A Microsoft account or MSA (previously known as Microsoft Passport,.NET Passport, and Windows Live ID) is a single sign-on Microsoft user account for Microsoft customers to log in to Microsoft services (like Outlook.com), devices running on one of Microsoft's current operating systems (e.g. Microsoft Windows computers and tablets, Windows Phones, and Xbox consoles), and Microsoft application ...
Outlook.com One-time password , Mobile alerts, Account verification via SMS or voice call in some countries, Rules,  Scheduled Cleanup,  Filter to e.g. only see newsletters or Emails from contacts,  Recover deleted emails;  Key encryption for paid accounts