Microsoft Exchange Server
Microsoft Exchange Server is a collaborative software server from Microsoft, positioned as a rival to the Lotus Notes / Domino server from IBM. The use of Microsoft Exchange is very widespread in large corporations using Microsoft infrastructure solutions.Among other things, Microsoft Exchange manages electronic mail, and is thus a popular mail server.
Microsoft Exchange Server uses a proprietary RPC protocol, of which only the API is documented (see MAPI), and is used almost exclusively from the Microsoft Outlook client. However there also exists a rival client program in the form of a plug-in program for Ximian Evolution called Connector.