Juha Christensen resigned as Microsoft Corp. corporate vice president of mobile devices in November to join a startup but has instead signed on with Macromedia Inc. According to InfoWorld, Christensen has been named president of Macromedia's <A HREF="http://www.infoworld.com/article/04/01/07/HNmacromediahead_1.html">mobile and devices business unit</A>. The mobile and devices unit is primarily focused on expanding use of Macromedia's Flash format by mobile phone makers and providers of content for mobile use.