I have been asked to install Dropbox in order to collaborate with a 3rd party vendor on some projects. This vendor already has a network of of others as part of his dropbox share. My concern is the potential of malware/viruses reaching me through this Dropbox share. It isn't scanned like our email. Should I be worried about this? I don't even know who the other parties connected to his dropbox are. Is Skydrive a better option? I really need some help here.