In this paper we present the DLM 3.0 project's vision for e-mail communication in enterprise. The project promotes the use of semantic techniques, based on case studies and ergonomic analysis to improve current email tools, in an enterprise context. The project's realm is to create a corporate social network centered on email, with email being connected to the company tools, and automatically interacting with them. In this paper we describe the in situ study of email usages we performed to identify both human factors and technical limits of current messaging systems, personal information management and work-flows. Then we describe the features we developed towards a corporate social network and the next steps of the project.