When Microsoft released Exchange Server 2007, one of the new features that received the most attention was unified messaging. Out-of-the-box unified messaging was certainly new to Exchange, but it wasn't Microsoft's first product to focus on unified communications. Long before Exchange 2007, Microsoft had created a unified communications product called Microsoft Office Live Communications Server (LCS). LCS was a nice first attempt at providing true unified communications capabilities, but it was really difficult to set up, and as with any first-generation product it was a bit lacking.
In 2007, Microsoft released a new version of LCS that was named Microsoft Office Communications Server 2007 (OCS). Like its predecessor, OCS was designed to be a full-featured unified communications platform, but it was still missing some features. As you may have already guessed, the features that OCS lacks have been incorporated into Exchange Server 2007. In fact, the two products were designed from the very beginning to be complementary and to integrate with each other. . . .
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