Windows Mobile 6 upgrade plans. Fast forward to now, and the very same company is getting official with the cutoff plans. October 31st will be the very last day (no tricks, folks) for select Windows Mobile 5 users to get a free upgrade to WinMo 6 via HTC's website. More specifically, October 31st at 12:00PM GMT -- after the clock strikes 12:01PM, the download link will be removed for eternity. The affected handsets are the S621, S620, P4350, P3300 and HTC Advantage, and while we'd typically encourage you to stop procrastinating and get on with the upgrade, we know in our hearts there's no way you're still rocking WinMo 5. Right? Right.