Outlook also acts as a messaging agent, in effect replacing Exchange. Read the FAQ to find out more. This is also known as universal messaging. Exchange can act on many message types. Exchange is an extremely powerful, capable, flexible, and extensible messaging program.
Exchange can handle faxes, e-mail of many types, pager messages, telex messages, and voice mail.
Services are what give Exchange the ability to work with a message of a particular type. It's Exchange's extensibility that make it work with these services so well. Also, you can use MS Word as your e-mail editor, and take advantage of it's full set of editing features, and the power of macros . Other Exchange Clients can receive the full rich text of the messages you create. Non Exchange clients will still see the content of your message, but with out all the extra rich formatting.