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MS announce free upgrade from Windows 7/8 to Windows 10 for non-corporate licences, from http://www.microsoft.com/en-us/windows/:
Get a free upgrade to Windows 10 starting July 29, 2015.
Is it safe to take this offer so any installed software and drivers would still work?
Is it possible to install and run without issues software that built for Windows XP/7/8 on Windows 10?
Is Windows 7 drivers compatible with Windows 10? I have out of life support hardware with drivers built for Windows 7...
1You need to assess your own software, one piece at a time; there's no way for us to say "Yes it will all work" as there are far too many Windows applications. Contact your hardware vendor(s) and see if they have/plan on providing Windows 10 compatible drivers. – Ƭᴇcʜιᴇ007 – 2015-06-11T20:44:38.230
1No; The display model changed three times between Windows 7 and Windows 10. Display drivers for Windows XP, Windows Vista, Windows 7, Windows 8.0, and Windows 8.1 are NOT compatible with Windows 10. – Ramhound – 2015-06-11T21:26:16.030
2The windows 10 installer will check and flag any potential hardware-driver issues before it actually installs the OS. – Moab – 2015-06-12T00:00:19.977
1This is what Microsoft said for the preview version, not much will change for RTM. "Drivers for basic functions like storage, networking, input, and display come with Windows. These drivers allow you to complete the Windows installation and connect to the Internet. You might be able to get more drivers from Windows Update." – Moab – 2015-06-12T00:03:21.787