Timely reality check from Volker
I hope this makes it crystal clear that Activities is not a Notes/Domino application. It runs on WebSphere Application Server, it requires WebSphere Application Server, and it has the characteristics of a WebSphere application. Notes 8 (the Eclipse version) will be able to run it, much likes Notes 7 can run browser applications.
I advise you to visit the Research lab at Lotusphere. For the last few years almost everything there has been running on WebSphere.
Source: vowe dot net :: On activities