You may have gotten an email like this, recently:  “We’re reaching out to let you know that if you haven’t updated your Dropbox password since mid-2012, you’ll be prompted to update it the next time you sign in. This is purely a preventative measure, and we’re sorry for the inconvenience. To learn more about why we’re taking this precaution, please visit this page on our Help Center. If you have any questions, feel free to contact us at pas...