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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 had sold a number of simpler email products before, but the first release of Exchange (Exchange Server 4.0 in April 1996) was an entirely new X.400-based client–server groupware system with a single database store, which also supported X.500 directory services.
The first release of Microsoft Exchange Server was version 4.0 in April 1996, when it was sold as an upgrade to Microsoft Mail 3.5. Before that, Microsoft Mail v2.0 (written by Microsoft) was replaced in 1991 by "Microsoft Mail for PC Networks v2.1", based on Network Courier from its acquisition of Consumers Software.
It is a web-based version of Microsoft Outlook, and is included in Exchange Server and Exchange Online (a component of Microsoft 365.) [3] [4] [5] It can be freely accessed from any web browser whether inside or outside an organization's network, [6] [5] and includes a web email client , a calendar tool , a contact manager , and a task manager .
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Beyond on premises installations of Exchange, the various personal and enterprise hosted services from Microsoft also utilize EAS, including Outlook.com and Office 365. The built-in email application for Windows 8 desktop, Mail app, also supports the protocol. Apart from the above, EAS client support is not included on:
Exchange Online Protection (EOP, formerly Forefront Online Protection for Exchange or FOPE) is a hosted e-mail security service, owned by Microsoft, that filters spam and removes computer viruses from e-mail messages.
Microsoft Outlook (not to be confused with Outlook Express, Outlook.com or Outlook on the web) is a personal information manager that replaces Windows Messaging, Microsoft Mail, and Schedule+ starting in Office 97; it includes an e-mail client, calendar, task manager and address book.