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With Office Outlook Web Access, you can use a Web browser to access your Microsoft Exchange Server mailbox from any computer with an Internet connection. You can use Outlook Web Access with Microsoft Internet Explorer or many other browsers for UNIX, Apple Macintosh, or computers running Microsoft Windows. Outlook Web Access is an effective solution for people who require roaming, remote access, or cross-platform functionality.
Outlook Web Access (OWA) 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 2007 and previous versions of Exchange.
OWA is used to access e-mail (including support for S/MIME), calendars, contacts, tasks, and other mailbox contents 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.