I am going to build out an RDS server on Windows Server 2012. 10 users from a remote location will RDP through VPN to the server and work remotely. They require MS Office. I know I have to have a volume license for MS Office. I want to be able to go from MS Office Standard to MS Office Pro in the future if needed. Will someone please explain what I will need in terms of RDS CALs, Windows CALs, and MS Office licensing for this scenario. I see that MS' "Open Value" licensing will allow me to do the "Step-up" (included with software assurance) to go from Standard to Pro, correct? If so, is an "Open Value" license ok to use with RDS?