In case you missed this or were confused about some of the tweets that have been going around Forefront now supports Lync 2010. The KB article calls out OCS in the title but in the verbiage includes Lync 2010. I know some folks have been waiting on this so its good to see its now available.
Features of the hotfix rollupHotfix Rollup 4 allows FSOCS to be installed on Lync 2010 (running on Windows 2008 R2 or Windows 2008 SP2 x64) in addition to Office Communications Server 2007 and Office Communications Server 2007 R2. As the feature set and patch level are the same as RU3, customers who have already deployed RU3 can update but are not required to do so.