Book excerpt: The advances in wireless communication technologies and the proliferation of mobile devices have enabled the realization of intelligent environments for people to c- municate with each other, interact with information-processing devices, and receive a wide range of mobile wireless services through various types of networks and systems everywhere, anytime. A key enabler of this pervasive and ubiquitous connectivity environments is the advancement of software technology in various communication sectors, ranging from communication middleware and operating systems to networking protocols and applications. The international conference series on Mobile Wireless Middleware, Operating Systems, and Applications (MOBILWARE) is dedicated to address emerging topics and challenges in various mobile wireless software-related areas. The scope of the conference includes the design, implementation, deployment, and evaluation of middleware, operating systems, and applications for computing and communications in mobile wireless systems. MOBILWARE 2010 was the third edition of this conference, which was made p- sible thanks to the sponsorship of ICST and Create-Net and most importantly the hard work of the TPC and reviewers. Similar to the last successful editions, we had 35 submissions from 23 different countries this year, reflecting the international interest for the conference topics. After a thorough review process, we finalized an excellent technical program including 18 regular papers and 4 short papers.