Right now I am running 2014 on oes11 sp2. Looking to upgrade to 2014 r2 soon, but am looking for advice on what to do with the server os. Upgrade to oes11sp3 now and then groupwise 14 R2 when ready ? Or Upgrade to 14 R2, leaving oes11 sp2 for now and then upgrade to oes2015 later ? I don't want to upgrade both at the same as I don't to create a problem and not know where they came from, but I also don't want to be in a bad combination OS/application wise. Thanks.