http://www.vflie.com/internet-explorer-technical-support/ http://www.vflie.com/internet-explorer-technical-support/ Leading up to the release of the final browser, Microsoft released updated platform previews, each featuring improved JavaScript compiling (32-bit version), improved scores on the Acid3 test, as well as additional HTML5 standards support, approximately every 6 weeks. Ultimately, eight platform previews were released.