Dropbox allows business users to have both a personal Dropbox and a work Dropbox account on computer. You can access them from any computer or mobile device. You need to download and install latest version of 'Dropbox Desktop Application'.
If you are installing the 'Dropbox Desktop Application' for the first time on Mac computer, then you will need to sign in to both Dropbox accounts.
If you are an existing Dropbox user, you will need to sign in to your second Dropbox account.