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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 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 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

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

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.