Google continues to gain share in the education market at Apple\u2019s expense. Chrome OS powers almost six out of 10 computing devices shipped to K-12 schools in the United States last year, according to a new report from research firm Futuresource Consulting.\n[ Related: How Google overtook Apple in education ]\nA growing number of inexpensive Chromebooks are making their way into U.S. classrooms while iOS -- and to a lesser extent MacOS -- devices are losing considerable share. Google\u2019s Chrome OS comprised 58 percent of the 12.6 million units shipped to primary and secondary schools in the United States last year, up from 50 percent in 2015 and 38 percent in 2014, according to the report.\n Futuresource Consulting\nDuring 2016 iOS\u2019s market share steadily declined to 14 percent, down from 19 percent in 2015 and 26 percent in 2014. Meanwhile, Microsoft has maintained relative stability in the education market. Windows powered 22 percent of all computing devices shipped in 2016 and 2015, according to Futuresource. Overall shipments of PCs and tablets were up 18 percent year-over-year to 12.6 million, up from 10.7 million in 2015.\n[ Related: With Watson Element, Apple and IBM aim to transform education ]\n\u201cThe strong combination of affordable devices, productivity tools via G-Suite, easy integration with third party platforms and tools, task management and distribution via Google Classroom and easy device management remains extremely popular with U.S. teachers and IT buyers alike,\u201d Futuresource wrote in the report.\nMicrosoft dominates Google and Apple in international market\nThe marked difference in share between Apple\u2019s iOS and Google\u2019s Chrome operating systems is less so outside of the United States. Windows dominates the education market in the rest of the world where it captured 65 percent of of the 13.6 million units sold in 2016, according to the research. Apple\u2019s iOS and macOs combined for 11 percent of the international market, while Google grabbed a 23 percent share last year.\nApple\u2019s share of the international education market has been stable since 2014, but Google isn\u2019t faring so well outside of its home country. Android, which comprised 1 percent of the U.S. market last year, has declined to 17 percent globally, down from 36 percent in 2014 and 26 percent in 2015, according to Futuresource.\n\u201cWhilst the growth of Chromebooks has certainly been a major headache for Apple and Microsoft, they are not standing still,\u201d the firm wrote in the report. Apple\u2019s \u201cClassroom\u201d app and education-specific features in iOS, including multi-user support for iPads, are a positive development for the Cupertino giant. Meanwhile, according to the firm, Microsoft should benefit from the launch of \u201cMicrosoft Classroom,\u201d new education administrator controls and the release of more Windows 10 devices that will compete with Chromebooks on price.