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MAC

MAC Address is a Media Access Control address or "hardware" address associated with a network interface.

Microsoft Exchange

corporate email platform

Microsoft Exchange Server

 mail server, calendaring software and contact manager.

It runs on Windows Server and is part of Microsoft Servers line of products.  It is a collaborative application product on the server side of a client-server.

Exchange Servers provide email accounts, centralized company address books, shared calendars and web browser access.

modem

device that connects a network to the Internet

MODEM This device connects the computer to a phone line so information can be sent from one computer to another.