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Microsoft Exchange Server is a calendaring and mail server developed by Microsoft that runs exclusively on the Microsoft Windows Server product line. Exchange Server was initially Microsoft's internal mail server. The first version of Exchange Server to be published outside Microsoft was Exchange Server 4.0. Exchange initially used the X.400 directory service but switched to Active Directory later. Versions 4.0 and 5.0 came bundled with an email client called Microsoft Exchange Client. It was discontinued in favor of Microsoft Outlook. Exchange Server uses a proprietary protocol called MAPI. Over time, however, it added support for POP3, IMAP, SMTP and EAS. Exchange Server is licensed both in the forms of on-premises software and software as a service. In the on-premises form, customer purchase client access licenses (CALs). In the software as a service form, Microsoft receives a monthly service fee instead. ==History== Microsoft had sold a number of email products before Exchange. Microsoft Mail v2.0 (written by Microsoft) was replaced in 1991 by "Microsoft Mail for PC Networks v2.1",〔(''"The box says Microsoft Mail for PC Networks v2.1, but under the hood users will find Consumer Software Inc's, Network Courier..."'' ), August 26, 1991, Computerworld〕 based on ''Network Courier'', which Microsoft had acquired.〔 When the original version of Exchange Server was sold to the public, it was positioned as an upgrade to Microsoft Mail 3.5. 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.〔〔 The directory used by Exchange Server eventually became Microsoft's Active Directory service, an LDAP-compliant directory service. Active Directory was integrated into Windows 2000 as the foundation of Windows Server domains. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Microsoft Exchange Server」の詳細全文を読む スポンサード リンク
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