For instance (1) its not immediately clear if this is "sign in to an office" or "sign in to a web site", (2) the last thing I want to do is type in my email address into a poorly motivated web demo, (3) there is no visual indication that I could scroll down to see what this is all about.
I grant though that selling the horizontal product is a challenge. Maybe your target customer sees it differently but that sign in form is something I could code up in less than an hour, it would look like hell and would take me another hour or two to improve it, there are other people who are better at web design and could have it looking great that quickly.
I'd like to see a demo of something that's actually hard or where your product delivers real value because a non-expert could make simple changes to it and have it be... simple.