"Microsoft appears to be developing a new and lightweight email client that can be used in tandem with its Outlook app. The app, called Flow, is apparently in internal testing among Microsoft employees for the iPhone."
"Use Flow with anyone, it's email: Reach anyone with an email address and all conversations for you and others are also in Outlook. Together, you can use Flow and Outlook interchangeably to participate in the same conversations.
"Fast, fluid, natural conversations: No subject lines, salutations, or signatures. Flow is designed for fast, light-weight conversations in real time.
"Focus on what's important: Only conversations started in Flow and their replies show up in Flow, not your whole inbox. Focus on your most important person-to-person conversations without the noise."