Yes the apps are from google play, basically android. The benefit of this are they are generally easy to use and not huge programs. You can download the android Microsoft App for Office 365 which I understand works well, caveat here, I haven’t used one but my friend love the simplicity of his...
Be tempted to get a chrome book version. If he needed to use office 365 for school work he can on line
http://https://www.currys.co.uk/gbuk/computing/laptops/laptops/lenovo-s345-14-chromebook-amd-a4-32-gb-emmc-grey-10203264-pdt.html