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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. Exchange initially used the X.400 directory service but switched to Active ...
Exchange Server was an entirely new X.400 -based client–server mail system with a single database store that also supported X.500 directory services. During its development, Microsoft migrated their own internal email from a XENIX -based system to Exchange Server from April 1993,  with all 32,000 Microsoft mailboxes on Exchange by late 1996.
Microsoft Mail (or MSMail/MSM) was the name given to several early Microsoft e-mail products for local area networks, primarily two architectures: one for Macintosh networks, and one for PC architecture-based LANs. All were eventually replaced by the Exchange and Outlook product lines. Contents 1 Mac Networks 2 PC Networks 2.1 Server Architecture
Background. Microsoft Exchange is considered a high-value target for hackers looking to penetrate business networks, as it is email server software, and, according to Microsoft, it provides "a unique environment that could allow attackers to perform various tasks using the same built-in tools or scripts that admins use for maintenance."
Microsoft Exchange can refer to: Microsoft Exchange Server, an email server software product from Microsoft Microsoft Exchange Client, the former companion client software for Exchange Server that was embedded into some versions of Microsoft Windows Microsoft Exchange Hosted Services, an email filtering system
Mail (Windows) Mail (formerly Windows Mail) is an email client developed by Microsoft and included in Windows Vista and later versions of Windows.   It is available as the successor to Outlook Express, which was either included with, or released for Internet Explorer 3.0 and later versions of Internet Explorer . Contents 1 Windows Vista
Microsoft (the word being a portmanteau of " microcomputer software" ) was founded by Bill Gates and Paul Allen on April 4, 1975, to develop and sell BASIC interpreters for the Altair 8800. It rose to dominate the personal computer operating system market with MS-DOS in the mid-1980s, followed by Microsoft Windows.