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Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft. It is part of the Microsoft Servers line of server products and is widely used by enterprises using Microsoft infrastructure solutions. Exchange's major features consist of electronic mail, calendaring, contacts and tasks, and support for the mobile and web-based access to information, as well as supporting data storage.
Microsoft Exchange Server uses a proprietary RPC protocol, of which only the API is documented (see MAPI). It was designed to be used by the Microsoft Outlook client. E-mail hosted on an Exchange Server can be accessed using POP3 and IMAP4, with clients such as Mozilla Thunderbird and Lotus Notes. Both Microsoft Outlook and Novell Evolution are clients capable of using the advanced features of Exchange Server; Microsoft Entourage for Mac also has most of the advanced features implemented in the latest version. Exchange Server mailboxes can also be accessed through a web browser, known as Outlook Web Access (OWA). Exchange Server 2003 also featured a version of OWA for mobile devices, called Outlook Mobile Access (OMA).   [edit]