The Accompli client is a crock of shit. It is less capable than the old Android in-box email client and it's only advantage is it doesn't require the whole device to be encrypted for a corporate account. The UI is pretty but the UX is painful and it is unreliable. Bugs don't get fixed and when new features turn up they're some marketing buzzword and not something users want.
What gets worse though is the once awesome email client on Windows Phone (yeah, I did say that) has been neutered and turned into an Accompli-look-alike as well.
And now this team are taking over Outlook. While it's not a great piece of software it at least is functional. Let's watch them strip out the useful capabilities and replace them with strong visual textures that are a delight to interact with.