In my tired daze I mistakenly read ONLYOFFICE as OpenOffice and was about to yell No!

The article does well and links to their other article on the OO 9.0 release, which explains why it's probably a smarter choice for this office situation when compared to LibreOffice:

ONLYOFFICE is one of two options that comes to mind when I think of a solid Microsoft Office alternative on Linux, the other being LibreOffice. Both offer a range of useful features and support a wide range of document formats. What sets ONLYOFFICE apart, though, is its focus on collaboration and generally reliable compatibility with Microsoft Office files.