For about the last week I have been ripping my hair out trying to install Essential Business Server for a project that I am working on. Every time that I have attempted the installation, I would get to the third server (the messaging server) and get an error that Setup failed because it was not able to extend the Active Directory schema.
I have gone over the Microsoft documentation numerous times, and it seems as though I am doing everything correctly. Tonight I stumbled onto an interesting Web page though (http://connect.microsoft.com/EBS08/community/discussion/richui/default.aspx?NewsgroupID=2554&RootArticleID=317560). Although Microsoft says that EBS will run on top of Hyper-V, there have apparently been a lot of problems with doing so. Although some people claim to have been able to pull off a full EBS deployment using Hyper-V, I am running out of time in getting this deployment done. Tomorrow I am going to try using physical hardware.