Is the Official Hotmail app for android really official?

So a few minutes ago I read on Android Central that Microsoft has released its official android app. I was pleased to see this and went to the Android Market to download it. Now I'm having doubts because the publisher isn't Microsoft Corporation but instead Microsoft + SEVEN. huh? Who's that? I tweeted Windows Live official twitter handle. I am curious to find out if it's real before I download and enter my windows live credentials.