Version 5.0 also introduced a new Web-based e-mail interface called Exchange Web Access, which was rebranded as Outlook Web Access in a later service pack. Unlike Microsoft Mail (which required a standalone SMTP relay), Exchange Server 5.0 could, with the help of an add-in called the Internet Mail Connector, communicate directly with servers using SMTP. Introduced the new Exchange Administrator console, as well as opening up 'integrated' access to SMTP-based networks for the first time. The first release of Exchange outside of Microsoft was Exchange Server 4.0 in April 1996, with five service packs being released over the next two years. Older version, yet still maintained: 2016 Older version, yet still maintained: 2013

Active Directory was integrated into Windows 2000 as the foundation of Windows Server domains. The directory used by Exchange Server eventually became Microsoft's Active Directory service, an LDAP-compliant directory service. 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. When the original version of Exchange Server was sold to the public, it was positioned as an upgrade to Microsoft Mail 3.5.Įxchange Server was an entirely new X.400-based client–server mail system with a single database store that also supported X.500 directory services. Microsoft Mail v2.0 (written by Microsoft) was replaced in 1991 by 'Microsoft Mail for PC Networks v2.1', based on Network Courier, which Microsoft had acquired. Microsoft had sold a number of email products before Exchange. The history of Microsoft Exchange Server begins with the first Microsoft Exchange Server product - Exchange Server 4.0 in April 1996 - and extends to the current day.

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