The agreement also drops all litigation involving Motorola Mobility, which Google sold to Lenovo Group Ltd (0992.HK) last year while keeping its patents.
However, as Microsoft and Google continue to make products that compete directly with each other, including search engines and mobile computing devices, the agreement notably does not preclude any future infringement lawsuits, a Microsoft spokeswoman confirmed.
"Google and Microsoft have agreed to collaborate on certain patent matters and anticipate working together in other areas in the future to benefit our customers," the companies said in a joint statement. They did not disclose the financial terms of the deal.
The companies said they have been cooperating on such issues as the development of a unified patent court for the European Union, and on royalty-free technology for speeding up video on the Internet.
One of the most bitter disputes between the rivals began in 2010 when Microsoft accused Motorola, later acquired by Mountain View, California-based Google, of breaching its obligation to offer licenses to its wireless and video patents used in Xbox systems at a reasonable cost.
In July, a U.S. appeals court ruled that the low licensing rate Microsoft pays to use the patents had been properly set by a federal judge in Seattle.
Wednesday`s agreement is not the first among smartphone heavyweights to settle their patent disputes. In 2014, Samsung Electronics Co Ltd (005930.KS) and Apple Inc (AAPL.O) agreed to drop all litigation against one another outside the United States.