The next iteration of Internet Explorer web browser, IE9 (Internet Explorer 9), has finally been officially released by Microsoft after its public beta and RC. The RTW (Release to Web) version of IE9 is equivalent to final and stable RTM version, and it has the build version number of 9.00.8112.16421.110308-0330, indicating it’s compiled, finalized and signed off on March 8, 2011.