As you can see, I no longer trust MS Windows to keep my data private.
One alternative is OS X, which is a series of Unix-based graphical interface operating systems (OS) developed by Apple Inc. It is designed to run on Macintosh computers. It has been pre-installed on all Macs since 2002. This is a proven and reliable performer. Unfortunately, the switch to Apple can be expensive as it really does require Apple hardware for optimum performance.
The advantage of OS X is that it runs MS Office and that keeps the natives calm, even if they have to hunt and peck through the GUI to find things. The open source LibreOffice and Open Office are different enough from Word (and Excel) to drive the writers in your organisation, me included, absolutely mad. There really is a steep learning curve for a new word processor and spreadsheet software. Keeping MS Office also allows you to keep your templates intact. However, even on OS X, MS Office creates its own threat surface.
If you must harden MS Office by eliminating all macro’s, portable templates, and most of it’s network and workgroup features, then that is the point where LibreOffice or Open Office becomes a better option.
There is little risk of a serious malware infection of OS X itself, especially if you use Little Snitch. OS X is easier to configure for online security as most of the work has been done for you. This isn’t the case with most versions of Linux.