Dropbox announced they were acquiring Mailbox last week, but didn't disclose the amount they paid for the company. Sources familiar with the deal have said the amount paid for such an early-stage company was high, with its price ballooned up thanks to interest from some well-funded companies.
GigaOM and TechCrunch have both claimed that Mailbox was acquired for a price "well over" $50 million, with a bunch of stock that pushes the deal closer to $100 million. Dropbox are worth somewhere between $4 billion to $5 billion, which makes their acquisition of Mailbox for the reported $50 million not sound so large for the cloud storage company.
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