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This paper presents our vision for an activity based pervasive computing system based on a virtual personal server space. Our target demographic is a group of elder computer users. Using collaborative interfaces technologies; we focus on reminiscence activities for their use in promoting social and intellectual fitness. Current computer applications while designed for single use are not suitable for activity based multi-application, multi-user, multi-device and multi-modal interaction. Our proposed architecture (middleware) consists of three planes of service (data, context and activity). The context plane mediates access to various services (depending on the current user activity) while optimizing data access (data plane) around simple activity models tied to user defined contextual states.