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You do understand that it's the IT department at the Fortune 500 company thats doing the blocking, right?

Dropbox has no control over your IT department, any more than you'd have control over my wireless internet.

And the question becomes: why is this IT department blocking the dropbox service?

Exactly.. some businesses are just not friendly to the idea of automatic synchronization of their very private data to a 3rd party.

For the same reason a lot of companies block USB ports on company computers: so you don't take work material without their knowledge.