I will never understand the persistent fetish to make E-Mail more like Instant Messaging. Sure, if you only send emails that are a couple of sentences this might make sense. But that's not what people use email for. That's what they use one of the bazillion IM services for. And the IM GUI vocabulary breaks down very quickly for real world email use.<p>The abstract root of the problem with "let's reinvent email clients" to me is this: There are things that I want to do in email and things I do not want to do in email. The "attachments reinvented" (really?) is such an example: Sure, you could show all the attachments for one person in one place. But when would I use that? In most cases what I want to do is move data out of email and get them where they are useful. Gluing them closer to the emails solves no problem for me.<p>I get that this is all social and everything, so as somebody who mostly uses email for work, I'm not the target audience. But either you mostly work stuff with emails (then this fails on a number of fronts), or you do mostly social... no wait, you don't do mostly social with emails. That's the problem. And that's why most email clients are not very satisfying for one particular use - because serving multiple uses at the same time simply is a dirty business.<p>Sorry to fall into the typical HN snark here, but that's how I feel: It does look nice, but so could a thunderbird theme.<p>Footnotes:<p>- "Sent with Unibox", really?<p>- No overview window (at least none shown - do I have to click through the people sidebar to find a recent email if I'm not sure what I'm searching for?)<p>- mentioning "Exchange" - be very careful here, saying that you support Exchange sets a very specific set of expectations that I'm pretty sure you cannot meet. In any case, you're probably inviting in customers that you don't want and it could cost you a lot of time and money to deal with them.