It's very simple: it Just Worked, and it was Easy. Those two things combined to make it feel like magic. The founder of Syncplicity (even the name sounds compl

It's very simple: it Just Worked, and it was Easy. Those two things combined to make it feel like magic. The founder of Syncplicity (even the name sounds complex!) said it best: "In the end, it really came down to one incredibly genius idea: Dropbox limited its feature set on purpose. It had one folder and that folder always synced without any issues -- it was magic. Syncplicity could sync every folder on your computer until you hit our quota. (Unfortunately, that feature was used to synchronize C:\Windows\ for dozens of users -- doh!) Our company had too many features and this created confusion amongst our customer base. This in turn led to enough customer support issues that we couldn't innovate on the product, we were too busy fixing things. After I left Syncplicity, I ran into the CEO of Dropbox and asked him my burning question: "Why don't you support multi-folder synchronization?" His answer was classic Dropbox. They built multi-folder support early on and did limited beta testing with it, but they couldn't get the UI right. It confused people and created too many questions. It was too hard for the average consumer to setup. So it got shelved."