Microsoft Exchange Server

Microsoft Exchange Server
	Exchange Server 2019 logo
Developer(s)	Microsoft
Initial release	April 2, 1996
Stable release	2019 CU14 Mar24SU (15.02.1544.009) (March 12, 2024) [±]
Operating system	Windows Server
Platform	x64
Type	Collaborative software
License	Proprietary commercial software
Website	www.microsoft.com/en-us/microsoft-365/exchange/email

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 Directory later. Until version 5.0, it came bundled with an email client called Microsoft Exchange Client. This was discontinued in favor of Microsoft Outlook.

Exchange Server primarily uses a proprietary protocol called MAPI to talk to email clients, but subsequently added support for POP3, IMAP, and EAS. The standard SMTP protocol is used to communicate to other Internet mail servers.

Exchange Server is licensed both as on-premises software and software as a service (SaaS). In the on-premises form, customers purchase client access licenses (CALs); as SaaS, Microsoft charges a monthly service fee instead.

^ Cite error: The named reference initial-release was invoked but never defined (see the help page).
^ "Exchange Server build numbers and release dates". Microsoft. Retrieved February 19, 2018.

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[2] "Exchange Server build numbers and release dates". Microsoft. Retrieved February 19, 2018.

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