This book constitutes the refereed proceedings of the Second International Conference on Mobile Data Management, MDM 2001, held in Hong Kong, China in January 2001. The 18 revised full papers and five industrial papers presented together with eight posters were carefully reviewed and selected from numerous submissions. The papers are organized in topical sections on data management architectures, content delivery, data broadcasting, caching and hoarding, coping with movement, and network and systems issues.