I need to rebuild my OES11 SP2 server from scratch due to a major crash. That is no problem, but I see that OES2015 is out and I am wondering what benefit that will give me over OES11 SP2. I see that both OES2015 and OES11 SP2 run over SLES11 SP3 so that is not the underlying reason for OES2015. (I was expecting that OES2015 would run over SLES11 SP4 or SLES12...) Any reasons or advantages to go (or not go) to OES2015? An idea why OES2015 is still based on SLES11 SP3?