The application of mobile computing technologies to Groupware Ststems has enforced the necessity of adapting the context of information by considering the user's physical and organizational contexts. In general, context-aware computing is based on the handling of features such as location and device characteristics. We propose to describe also the user's organizational context for awareness purposes. Our objective is to permit Groupware Systems to better select the information and then to provide mobile users with some adapted awareness information. This paper presents a representation of this notion of context to be used by awareness mechanisms embedded in Groupware Systems. Then, we show how this representation is exploited for filtering the content of information inside the awareness mechanism.