Microsoft is gunning for IBM's Lotus Notes users in an effort to <A HREF="http://www.theregister.co.uk/2005/07/08/microsoft_notes/">quadruple the size of its ISV partner community</A> around the Office desktop productivity suite. The company will launch a sales and marketing campaign in September that encourages 100m Notes customers to build their future collaborative software applications and services on Office and SharePoint Portal Server.