This document provides vendor strategists with an overview of the key trends and market insights of the open source adoption in Asia Pacific based on interviews with 442 CIOs, IT managers and business managers from both large enterprises and SMBs in ASEAN (Singapore, Malaysia, Philippines) Australia, India, People's Republic of China, and New Zealand. Our research assesses current open source penetration in Asia Pacific, future adoption plans and the satisfaction level with open source among existing users. Vertical industries included in this document among others are banking and financial services, manufacturing, the public sector, telecommunications, utilities, and energy.