Dropbox has long been an incredibly popular choice for cloud file storage and sync, and the company announced Monday it hit an important milestone: It has 500 million registered users. 

That number leaves out a lot of information. It’s unclear whether Dropbox has 500 million unique people registered to use its service, or if it has 500 million registered accounts, with some people using multiple accounts. The company also didn’t say how many of those accounts are active. 

Dropbox also said that it has 150,000 businesses paying for its product — which is the same figure it unveiled at a conference in November. In Monday’s announcement, the firm said it adds 25,000 paying business customers each quarter, meaning it now should have upwards of 175,000 paying customers. 

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