I have had Libre Office installed under Windows 10 on several machines. Open Office will install, too.
With regard to Office 2007 having reached end of life and security updates ceasing, to be perfectly honest that would not concern me very much at all except in regard to Outlook 2007, which has constant interaction with cyberspace. All other Office files are either created by the user or, if they have anything even vaguely current as far as antivirus/security suite, scanned upon download and blocked before they can even make it on to a machine if compromised. I can't remember if auto-execute of scripts is turned off in 2007 or not, but it is in 2010. I think 2007 has protected mode on by default, too, but again I can't be certain because I stopped using 2007 very shortly after 2010 came out.
The probability of getting an infection via an MS-Office file on machine with even fairly basic, but current, "shield" technology is very, very small. It's infinitesimally small if one only downloads or detaches files from trusted sources to begin with.
Edited by britechguy, 17 March 2018 - 10:39 AM.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134
Memory is a crazy woman that hoards rags and throws away food.
~ Austin O'Malley