Well, I think I speak for a lot of people when I say that anything Microsoft produces is out of question. The reason for that is that whenever I use one of their products, it progressively turns into a locked proprietary program and getting out of it becomes impossible. That's fine if the product remains unbeatable in quality but it's rarely the case to say the least. I try to not have that happen again and FOSS never lets me down on that.

There is also the question of privacy. That's why my Org files are on my ownCloud and I have peace of mind forever.