I upgraded our IPO 500V2 from 9.0 to 9.1 - no problem. I try to upgrade our VM pro from 9.0 to 9.1 and I get the following error: "Required IIS components are not installed on this machine. Below VMPro components are dependent on IIS. Voicemail Pro Campaign Web Component Web Voicemail." (Windows Server 2012) We are using One-X and IIS was installed and working on 9.0. I have uninstalled VM Pro 9.0 as well as IIS and One-X. I Reloaded IIS, tried installing VM PRo 9.1 clean install but still get the same error. I then re-installed VM Pro and One-X with no problem. Does anyone know of additional IIS components required for 9.1 VM Pro/One-X that weren't required for 9.0? I would really like to retain what little hair I have left on my head! Any help is appreciated!