I’ve been waiting for this one for a while:
Cumulative Refreshes (CRs) consists of a set of cumulative fixes for each of IBM Connections applications. For additional information on CRs, including instructions on how to download and install, please review the Update strategy for IBM Connections 3.0.1.1 document.
CR2 is composed of this set of 14 cumulative fixes, which update the whole application.
Details of the fixes included are available in this technote, download the fixes from FixCentral.