Thanks RedAvenger. Exchange Instant Messaging Service is catered to corporate enterprises as a component of Exchange 2000. Microsoft .NET Messenger Service is an available Internet service for the public. You get both .NET Messenger Service and Exchange Instant Messaging Service from one client that is available for download from this page. If you are currently using Windows Messenger as a part of Windows XP, the file that you download from this site upgrades your client to Windows Messenger 4.5. If you are currently using MSN Messenger, the file that you download from this site upgrades your client to MSN Messenger 4.5.
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