Beginning in June 2015, Unified Communications Suite (UCS) software is delivered as three separate products - Oracle Communications Messaging Server, Oracle Communications Calendar Server, and Oracle Communications Instant Messaging Server. Each product download enables you to download additional software that you have a right to use. For example, the Oracle Communications Messaging Server download enables you to download Oracle Communications Convergence and Oracle Communications Indexing and Search Service software.
Also to note, the UCS documentation is being reorganized. As each product is released, its revised documentation will be on docs.oracle.com, rather than on wikis.oracle.com. See the above MOS Knowledge Article for more details.