Microsoft releases final IE9 preview, beta due in September
Internet Explorer 9 continues its steady pace toward a final release. Today's milestone is an important one. The fourth and final Platform Preview, like its predecessors, is intended for developers to test their web sites and report bugs.
Context & Ripple Effects
Microsoft has been running Internet Explorer 9 through an unusually public development cycle: rather than the single first-look that accompanied Internet Explorer 8 back in 2008, the IE9 program has shipped four successive Platform Previews aimed squarely at developers testing their sites and filing bugs.
Today's fourth and final Platform Preview closes out that phase, with the syndicated pickup on MSD Blogs framing it around HTML5 modernization — and Microsoft confirming the next step is a beta in September, moving IE9 from developer workbench to consumer product.
First-order effects
- Web developers lose their bug-reporting window on the pre-beta engine: today's preview is the last chance to flag rendering problems before the codebase hardens into the September beta.
- Microsoft's own roadmap locks in — the confirmed September beta date turns a rolling preview experiment into a dated shipping commitment.
Second-order effects
- Sites that validated against the four previews now have a stable target to code against, which pulls real-world pages toward the HTML5 feature set the previews expose ahead of the beta.
- Any browser vendor still on slow, closed development cycles faces pressure to match Microsoft's cadence of public, incremental previews, or cede the developer-mindshare race that IE9 is explicitly designed to win back.
Third-order effects
- If the pattern holds, browser releases stop being multi-year monoliths — the 2008-to-2010 gap between IE8 and the IE9 cycle gives way to continuous, developer-facing iteration — making standards support like HTML5 the competitive axis instead of bundled features.
- For Microsoft specifically, the browser becomes a credibility project: after a bruising summer that included the Kin failure and July's targeted layoffs, executing IE9 cleanly is one of the few visible ways to demonstrate engineering momentum.
The trend: Browsers are shifting from long, opaque release cycles to rapid public previews organized around HTML5 standards, with Microsoft's IE9 program as the late entrant trying to close the gap.