I received this TomTomGo50 6 October 2014. Because it is a new product, there had not commented on its compatilbilité with Windows 8.1 on Amazon or elsewhere. When I logged into my ordinator for the records and update it, I found that my Windows 8.1 operation system was not compatible. After spending a lot of time on the phone to TomTom Support to resolve the problem without success, I discovered that it lacks the "driver" for Windows 8.1. I downloaded it from the internet and viola, it works fine. Nevertheless, during my efforts to solve the problem, I can confirm it works well with Windows 7. Neither the box nor the packaging gives avertisement this problem. I updated TomTom Support because this problem will be global.