If email were invented today, it might operate in a fundamentally different ways, says Nathaniel Borenstein, chief scientist at the email company Mimecast. He explains to ZDNet that email communications are based on open standards that can be sent from one system to another, say Gmail to Yahoo Mail. He said that if the same type of program were invented today it might be a closed system, the way that social networks operate. For instance, if you are communicating on Facebook you can't directly message someone on Google+.