The MS Office suite is far more user friendly than the alternatives.
I still use Libre Office on Ubuntu and I wonder why they chose to be so different. It would be great if they could completely copy MS Office in UI/UX, but there's probably some kind of copyright there right?
The thing is, OpenOffice (and by descent LibreOffice) did copy MS Office's UI/UX. Then Microsoft switched to the "Ribbon" interface, throwing all that shared knowledge out the window. Recreating the Ribbon in LibreOffice is an active development task, last I checked.
I don't recall the outcome of that "Apple claims ownership of rounded corners" lawsuit, but I suspect (being absolutely not a lawyer) that'd be the relevant case law.
This really depends on the Google v Oracle lawsuit currently. If Oracle wins then the remains of VisCalc will have a copyright claim against everyone...
