[CptJamesCook]

It's a safe bet that 80-90% of dropbox users are on a PC.

[noam87]

(Some of us on Linux)

[jeorgun]

If it's more than 10-20% of Dropbox users, that says pretty bad things about their market share.

[thinkingkong]

Based on what?

[Toenex]

Given Apples 7.6% share of the 'PC' market as reported in 3Q15 (http://www.gartner.com/newsroom/id/3146617) I wouldn't be suprised that the vast majority of dropbox users are on Windows, simply because the vast majority of computer users are.

[gaius]

It's not about users. Its about paying customers.

[shampine]

Safety.

Edit: It was probably a reference to that it is "preinstalled" on retail machines.