It's possible with intervention from Dropbox staff. When I first set up the business version, I didn't quite understand what was going to happen (and it is all

It's possible with intervention from Dropbox staff. When I first set up the business version, I didn't quite understand what was going to happen (and it is all very non-intuitive, I found) and long story short I basically lost my personal account. I freaked out but support restored it and I used another email address for my business account. Then I used dropbox portable to juggle two dropboxes on one machine, but that was a pain in the ass, so I just used some computers for personal and others for business.