@Hiroki @Karsten: Service Packs are cumulative and include all fixes from previous RUs. Exchange 2010 SP3 does include all fixes included in Exchange 2010 SP2 RU6.
@Hiroki: http://technet.microsoft.com/en-us/library/jj916234%28v=exchg.141%29.aspx
Issues That Are Fixed in Exchange 2010 SP3 will be updated to include RU6.
Published Feb 13, 2013
Version 1.0