Adobe has put an end to much speculation, announcing that it will take Flex into the open source realm and make the source and documentation available under the Mozilla Public License. This move certainly ratchets up the battle between Flex and Microsoft’s Silverlight technology — both are used to create rich Internet apps. Microsoft has targeted Flash and Flex, so Adobe apparently has come to believe that open source is the best option for gaining ubiquity for Flex. Traditionally, Microsoft has had the edge with developers; Adobe with designers. Adobe is clearly hoping this move will shake that up.