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In this paper we present our work on personal information management by exploiting both context ontology and landmarks. The context model introduced is based on location, agent, time, and category of information corresponding to the 4 Ws: where, who, when, and what. Each of them represents one dimension of an information item. Semantics of each dimension are explicitly described in the ontology for personal information items along with their inter-relation. Therefore a necessary modification of the LATCH model has been investigated in-depth for its usage for personal information management and further retrieval. Navigation in the information space is supported by the use of landmarks.