The Windows 8 Mail app
A few hours back the Microsoft Exchange team published a blog post on how to connect and support your Windows 8 Mail app with Exchange. It has a lot of good info on which Exchange ActiveSync (EAS) policy settings are supported and how the App reacts.
Most of those things I already discovered in earlier blog posts of mine, using the Windows 8 Consumer Preview. It seem as if there are no massive changes since then. But I did dig somewhat deeper into some specific features. So, check my two blog posts out as well: