Users planning to use the just released ChevronWP7 unlock tool on their shiny new Windows Phone 7 device might want to hold off. Microsoft has responded saying that, "Attempting to unlock a device could void the warranty, disable phone functionality, interrupt access to Windows Phone 7 services or render the phone permanently unusable.” It is not clear if Microsoft plans to actually disable Live services to devices that have been unlocked in this way, or if they simply meant this tool could damage the phone.
ChevronWP7 uses the Microsoft XAP files leaked earlier this month to register the device as a developer unit, without going through Microsoft. This lets users sideload applications outside of the Marketplace. Some observers worry this would be used for piracy. The WP7 system currently only allows 10 developer apps to be sideloaded, but that limit could be circumvented in a future version of the tool. Would you take Microsoft's word, or just go for it?