Microsoft and Amazon.com have signed a wide-ranging patent cross-licensing agreement that provides each company with access to the other's patent portfolio. Specific terms of the agreement were not disclosed, but it was made clear that Amazon will be paying Microsoft an undisclosed amount of money as part of the arrangement. While Microsoft wouldn't say which of its products and technologies Amazon is interested in, Microsoft did mention that Amazon's Kindle, which employs open source and proprietary software components, as well as Amazon's use of Linux-based servers are covered.