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A global wave of cyberattacks and data breaches began in January 2021 after four zero-day exploits were discovered in on-premises Microsoft Exchange Servers, giving attackers full access to user emails and passwords on affected servers, administrator privileges on the server, and access to connected devices on the same network.
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, [3] with all 32,000 Microsoft mailboxes on Exchange by late 1996.
Microsoft had sold a number of simpler email products before, but the first release of Exchange (Exchange Server 4.0 in April 1996 [1]) was an entirely new X.400 -based client–server groupware system with a single database store, which also supported X.500 directory services.
This is a list of Hypertext Transfer Protocol (HTTP) response status codes. Status codes are issued by a server in response to a client's request made to the server. It includes codes from IETF Request for Comments (RFCs), other specifications, and some additional codes used in some common applications of the HTTP. The first digit of the status code specifies one of five standard classes of ...
The list does not include web hosting providers who may offer email server and/or client software as a part of hosting package, or telecommunication providers ( mobile network operators, internet service providers) who may offer mailboxes exclusively to their customers.
The comparison of mail servers covers mail transfer agents (MTAs), mail delivery agents, and other computer software that provide e-mail services. Unix -based mail servers are built using a number of components because a Unix-style environment is, by default, a toolbox [1] operating system. A stock Unix-like server already has internal mail ...
Outlook on the web (formerly Outlook Web App and Outlook Web Access [2]) is a personal information manager web app from Microsoft. It is a web-based version of Microsoft Outlook, and is included in Exchange Server and Exchange Online (a component of Microsoft 365 .)
This is a list of Simple Mail Transfer Protocol (SMTP) response status codes. Status codes are issued by a server in response to a client's request made to the server.