Chronic Dev-Team has just released the Greenpois0n iOS 4.2.1 untethered jailbreak for Windows. Greenpois0n for Mac is already available to public. Using Greenpois0n you can untethered jailbreak all iOS devices running iOS 4.2.1 without having saved SHSH blobs.
Download greenpois0n for Windows from here. Stay tuned for complete guide.
Update 1: Follow the step by step guide posted here to untethered jailbreak iOS 4.2.1 on iPhone, iPod touch and iPad.
Update 2: Greenpois0n updated to jailbreak iOS 4.2.6 on Verizon iPhone 4.
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