The good news was, that now the localized versions of R2 are available at MSDN. So we had the idea to upgrade one of our servers Unfortunately Exchange 2007 (SP1 incl. Rollup 9) is running on this machine. So we get an error while upgrading, because it seems that Exchange 2007 is only supported with SP2 (which might be available in a few weeks or month) under R2. Anyone with the same problem (or even a solution) ?