What will I lose on my phone if I remove Dropbox?

I want to remove the account but it says "Removing this account will delete all of its messages, contacts, and other data from the phone!" I do not even recall setting up an account, but may have just forgotten. I don't mind too much if the photos disappear as I have already loaded the ones there to my computer and am not syncing. But I do not want to lose all my contact information and text messages that are in my phone.

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