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Microsoft Exchange Server is a mail server and calendaring server developed by Microsoft. It runs exclusively on Windows Server operating systems. The first version was called Exchange Server 4.0, to position it as the successor to the related Microsoft Mail 3.5.

A global wave of cyberattacks and data breaches began in January 2021 after four zero-day exploits were discovered in on-premises Microsoft Exchange Servers, giving attackers full access to user emails and passwords on affected servers, administrator privileges on the server, and access to connected devices on the same network.

Outlook on the web (previously called Exchange Web Connect, Outlook Web Access, and Outlook Web App) is a web business version of Microsoft Outlook, and is included in Office 365, Exchange Server, and Exchange Online . Versions Outlook has replaced Microsoft's previous scheduling and email clients, Schedule+ and Exchange Client .