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We really love Microsoft's current Outlook email app for Android and iOS. Now it looks like the same team may be developing a new service called Flow that blends the best of email and instant messaging into a single experience.

Spotted by Twitter user @h0x0d, Flow is apparently still in development and likely headed to the iPhone first. The service promises to let you contact anyone with an email address without all the formalities that come with it. "No subject lines, salutations, or signatures," Microsoft explains. "Flow is designed for fast, light-weight conversations in real time."

It sounds like a pretty great idea, especially for work emails that require a quick response. Microsoft actually scooped up the current Outlook last year by buying Accompli, a popular email app, and rebranding it. Now it looks like the same team may be hard at work on a brand new service.

For now, Flow is still supposed to be a secret, and Microsoft isn't responding to the leak with any more details.  Still, it probably won't be too long before the app makes its official debut on the iPhone, and hopefully an Android version won't be too far behind.