High Tail (formerly YouSendIt) is perhaps something more familiar for exchanging Big Data Files. The iOS app launched in June 2011 and allows you to send large files. Formats in pdf, doc, docx, ppt, xls and tiff On the iPhone you can add text and images to documents and send them afterwards. The handy is that you can set. Example, a digital signature to a document. Users with a free account stuck to a limit of 250 MB per file, 2GB of storage space and 5 e-signatures. With a Pro account of € 14.99 per month or € 149.99 per year you will have unlimited storage and unlimited e-signatures. There is also a more expensive account for teams. High Tail is more focused on business users and teams. Pros: reasonably current app, available on many platforms: Mac, Windows, Outlook, web and mobile. High Tail has received an investment from Western Digital, a well-known manufacturer of hard drives.