Google Wave has variously been described by commentators as an e-mail killer, a Twitter killer and a SharePoint killer. To understand the reasons why Google is launching such an ambitious application we need to understand the two battles that Google is fighting at the moment: their battle to wrest control of computing inside the organisation away from their great rivals Microsoft their battle to retain the relevance of their search engine, developed in a previous era of the web’s development,  to the real time web Google’s battle with Microsoft for the enterprise The competition between Microsoft and Google is different from any past battle between giant companies.    Pepsi versus Coca-Cola pitted two companies against each other who sold the same thing to the…