Insider preview
I have had the windows 10 insider preview on a spare laptop for a while and was beginning to think it was becoming a reasonable OS to replace 7. However after seeing the extent of 'phoning home' it does I am staying with windows 7 and office 2010 until 2020 or whenever the EOL date gets extended to. I will also read the description for each windows 7 update to make sure they are not capturing data to send to MS.
I have had a play with Linux mint and see that it has possibilities as a replacement.