Adobe has decided to end official support for the Linux version of Adobe Integrated Runtime (AIR) owing to the limited popularity of Linux as a desktop operating system and no signs that it will become more popular in the future.
AIR allows programmers to create cross platform applications and today a host of popular apps are built around the adobe runtime environment, including Tweetdeck, iPlayer and more. AIR 2.6 incidentally was the last release of the platform for desktop version of Linux.
Analysts believe that it makes more sense for Adobe to focus on Google’s Android OS and iOS which are steadily increasing their market share. When nearly 200 million smartphones are expected to be around by the end of 2011, most of them running iOS or Android, but Linux has only gained about a percent of market share in that time, so it's no surprise that a sliver of PC users are no longer a priority.
Explaining the rationale behind the decision, Adobe commented in a blog post “our own desktop Linux releases have accounted for less than 0.5% of lifetime AIR downloads” and went on to add “We will no longer be releasing our own versions of Adobe AIR and the AIR SDK for desktop Linux, but expect that one or more of our partners will do so”.