right now i have server 2008 standard with slp key and cert with slic (hardmod) activation the slp key will work on the "r2 rc" version of server 2008 standard?????
No, Both Windows 7 and Server2008 R2 are still in beta (Release Candidate) testing. There won't be any working Keys, Slics or Certs till it hits Release (RTM) If you won't to upgrade your server just install the SP2 update for Server 2008.