My team is planning to upgrade our entire company (20,000+ users) to BOEXI R2 SP4 (premium license) and I am trying to decide best way to go as far as using IIS or WebSphere as app server for our BO clustered environment. Also, we are trying to decide on whether to deploy our environment to Windows servers on VMWare (as we use today) or Unix servers. Of course, if we go with Unix platform, IIS is not an option. Most of our experience is on setting up and supporting BO on Windows servers using IIS, but would like to know if there are any advantages to going with Unix platform and how is customer support from BO around Unix platform. Also, how much more difficult is setting up and upgrading BO on a Unix platform than a Windows platform, if at all. My team has already setup a few standalone BOEXI R2 environments running under IIS and we have not had any problems to date. However, going with IIS limits our ability to use Voyager and Dashboard Builder products. However, Windows AD single sign-on authentication is easy to setup in IIS and not sure how difficult it is to setup in WebSphere or if it is even possible. So if anyone has experience deploying and supporting BOEXI R2 premium environment using a WebSphere app server on Windows or Unix, I would appreciate any feedback. Also, any advantages or disadvantages you have experienced between using Windows/Unix and IIS/WebSphere, would be good feedback.