Outlook Web Access

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Outlook Web Access (OWA) originally called Exchange Web Connect (EWC), is a webmail service of Microsoft Exchange Server 5.0 and later. The web interface of Outlook Web Access resembles the interface in Microsoft Outlook. Outlook Web Access comes as a part of Microsoft Exchange Server. It has been renamed once again in Exchange Server 2010, this time to Outlook Web App.



OWA is used to access e-mail (including support for S/MIME), calendars, contacts, tasks, and other mailbox content when access to the Microsoft Outlook desktop application is unavailable. In the Exchange 2007 release, OWA also offers read-only access to documents stored in Microsoft SharePoint sites and network (UNC) shares. Microsoft provides Outlook Web Access as part of Exchange Server to allow users to connect remotely via a web browser. Some of the functionality in Outlook is also available in this web "look-alike". The most important difference is that Microsoft Outlook allows users to work with e-mail, calendars, etc., even when a network connection is unavailable, whereas OWA requires a network connection to function. OWA can be used from Internet cafes and any other location that provides connectivity to the Web.


The OWA interface available since Exchange 2000 comes in two flavors, one with a complete feature set (known as "Premium") and one with reduced functionality (known as "Light"). Prior to Exchange 2010 "Premium" access required Internet Explorer. Exchange 2000 and 2003 require Internet Explorer 5 and later[1][2] and Exchange 2007 requires Internet Explorer 6 and later.[3] Exchange 2010 requires Internet Explorer 7 and later but also supports Mozilla Firefox 3.01 and later, Google Chrome and Apple Safari 3.1 and later for full functionality.[4] In all versions of Exchange, the "OWA Light" user interface (UI) is rendered for other browsers. While the basic interface did not support search with Exchange Server 2003, the UI has been reworked for Exchange Server 2007 and OWA Light now supports search for mail items, and managing contacts and the calendar has also been improved.[5][6]


The first component to allow client-side scripts to issue HTTP requests (XMLHTTP) was originally written by the Outlook Web Access team. It soon became a part of Internet Explorer 5.0. Renamed XmlHttpRequest and standardized by the World Wide Web Consortium,[7] it has since become one of the cornerstones of the Ajax technology used to build advanced web applications.

See also


External links

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