I am currently running GW 2014 R2 HP1 on a Xen VM with OES 11 SP2. I am planning to upgrade to GW 2014 R2 SP1 and also upgrade my server OS. I am not using the server for any OES directory support, only NSS for the groupwise directory. The question is probably subjective, but I am looking for input on upgrading the groupwise server OS to OES 2015 SP1 versus SLES 12 SP1 within the VM.

Thanks for any comments.