Just recently, we learned about a way to run non-Windows Store apps on a Windows RT device via a circumvention method that requires tinkering with the portion of the RAM that instructs Windows RT on whether it should run unsigned code or signed code.
This jailbreak attempt was brought to Microsoft's attention and the company issued a statement not only applauding the jailbreak attempt, but also hinting that this circumvention method will most likely be gone in the near future.
Now, a jailbreak tool has been released which is based upon the circumvention method discovered recently. The jailbreak tool is simply a batch file that does most of the work for you so you can run unsigned apps, but will need to be re-applied every time the system is rebooted. Microsoft recently hinted that a patch would be coming soon in an official statement regarding the jailbreak. In response to that, the maker of the jailbreak tool had this to say: "They can patch it through Windows Update, but since we have the ability to reinstall from recovery partitions we can revert any Windows Updates they release."
This is obviously another step towards a full working jailbreak for Windows RT. Microsoft recently applauded the jailbreak attempt and it is unsure if Microsoft will make a big deal about it. "We applaud the ingenuity of the folks who worked this out and the hard work they did to document it. We’ll not guarantee these approaches will be there in future releases,"Microsoft originally mentioned in an official statement.