This seems like a good time to resurface the worlds best Quora answer, by Michael Wolfe. Answering “Why is Dropbox more popular than other tools with similar functionality?”: Well, let's take a step back and think about the sync problem and what the ideal solution for it would do: There would be a folder. You'd put your stuff in it. It would sync. They built that. Why didn't anyone else build that? I have no idea. "B…
Steve Jobs may have been right when he said something to the effect of Dropbox isn't a product, it's a feature . If all you want is a folder that syncs, then don't we get that from every commercial operating system?
So yeah for people that don't have much and just want to keep some data synced across some machines.. yup onedrive is great and there's no reason to use a third party service when you can just log into your windows with your live account and it's all synced. But if you've ever run into the problems with onedrive then it's a complete killer. You can't use a file syncing service that doesn't work perfectly all the time.