My company are thinking of buying the new Blackberry phones (Z10 and Q10). We are aware that our phone providers are not going to be offering the BIS services for these new phones but it is critical for us to keep this. So we are considering installing a Blackberry Enterprise Server from scratch. We have been researching this but we still have some questions that we cant seem to answer. Mainly do we need BES 5 to install BES 10?