Can I use Carousel or Mailbox with Dropbox for Business?
Both Carousel and Mailbox are intended for personal memories and correspondence, so they won’t connect with Dropbox for Business accounts. It's also not possible to join a Dropbox for Business team with a Dropbox account that is already connected to Carousel. If you have a personal account connected to your Dropbox for Business account, you can log in to Carousel or Mailbox using that personal account. If you have not yet linked your accounts, click the button below:
Creating a new personal email address for use on a Business account
One other work-around is to transfer your Dropbox for Business account to a new personal email address. When you attempt to the join the Dropbox for Business team, you should be prompted to do so.
You'll need to make sure to choose a new personal email address. If you already have a Dropbox account with your personal email address, choose a different personal email address without a Dropbox account attached.
Then once you've joined the team, you can transfer files between your two personal Dropbox accounts until you have all files located on the same account.