This doesn't solve the problem. Once dropbox is installed on one of the OS's, and the Dropbox folder is moved to the shared partition, the Dropbox application on the other OS won't allow you to use that same folder as your Dropbox directory: it issues a "This folder already contains a Dropbox directory" error and can't change the default location." This happens regardless of whether you install Dropbox on one OS first, or on the other. It would be extremely useful, both for space-saving, and convenience. Is there a way around this?
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