Hi, across users! Today I've got a Microsoft Lumia 640 on which Windows 8.2 was initially installed. Across for Windows and macOS work without any critical problems (For your reference, Windows 8.x doesn't support mouse at all). Then I updated it to the latest Windows 10 (Ver 1511, OS build: 10.0.10586.107) and have confirmed that Across for Windows and macOS work almost perfectly with good keyboard/mouse operation. The only problem that I have found until now, is not working of the "Screen on/off" in the multimedia input window for Across for Windows (It works well for Across for macOS). Though this is just 2 hours test, I think you can use your Windows phone with Across reliably. Let me test it more thoroughly and update the results. If you are a Windows phone user, leaving your test results will be appreciated. Edit1: Regarding the only one problem of the "Screen on/off" for Across for Windows, I've found what the problem is. I am guessing MS Windows Mobile OS developers would support our Across. They implemented the Ver,1511 as to be suitable for the previous version of Across. Therefore the key works on Across for macOS, but doesn't for Windows. So I hopefully think that the next major update of Window 10 Mobile will fix this issue.