All B2B invoicing in Europe is moving towards the mandatory sending of invoices via the Peppol network. Some countries already require this, and all others in the European Union will have to implement this within the next couple of years. Dropbox can either wait until it has to do this, or provide its customers a better service by already implementing it today. ;-) This would alleviate the need to send any business customer a PDF invoice because the Peppol invoice will be required by law.