What's the difference between the difference some of the Microsoft Unified Communication Products? Primarily Microsoft Office Live Meeting and Microsoft Office Communicator? The two seem very similar, but I don't quite know what each one is especially useful for.
Or are they all integrated into one product, but marketed as different products?
Microsoft Office Communicator is a Instant Messaging client, similar to Live Messenger, AIM, or Yahoo! Messenger.
Live Meeting is an application that allows you to conduct presentations. You essentially have a room which people can join, see your desktop, or see powerpoint presentations.
Both of these products require a server install called Office Communications Server. The latest release is called OCS 2007 R2.