Intradomain Federation is not pretty.  Your IM to IM conversations will work, but multi-party IM does not and it fails with little information to the end user.  Also, desktop sharing obviously won't work, again with little information for the end use...

This is pretty typical.  CUCSF is the cause and the upcoming 8.5 version doesn't get any better from what I hear.  We are using CUCIMOC integration with OCS.  CUCIMOC uses the same code in CUCSF.  We are pretty much going to have to wait on it, but C...