When that happens, it is but a snap for you to initiate a conversation through the tapping of a contact, or you can also opt to send a predefined quick reply by swiping to the right on a contact. Do be aware that regular emails will not appear in Send. Rather, the app will focus on the IM-style conversations that are initiated within Send itself, making Send function more like an IM extension of Office 365 emails.
Do you think that Send will be able to streamline email communications in the future, as it drops the subject line? Perhaps, but there is always room for email even down the road, as there are just some things which should not be compromised – and it is also a whole lot easier to keep track of what the topic is at a glance. Send leans more toward the transmission of simpler, shorter, more informal messages.