Microsoft has a ton of apps on the Google Play Store already, many of which are from the Microsoft Garage. Which is a section of Microsoft that creates apps for all sorts of purposes. However, this app is not part of the Microsoft Garage, instead it's from the Office team. Microsoft Bookings is actually a feature that the company debuted in their Office 365 Business Premium plan back in July of this year. The company announced that apps for Microsoft Bookings would be coming soon, and today, it landed in the Google Play Store, however it's only available for beta testers right now.
Admittedly, this is a pretty niche app, but it is still very useful. It's largely targeted at small business owners, as Microsoft Bookings allows you to keep track of your employees appointments, bookings, schedule and such. This can be very useful for say a secretary that can book appointments for multiple people. Users are able to create and edit bookings through the app, just as they can through the web interface. Additionally, employers have the ability to adjust an employees availability at will. It's a great tool for small business owners, and now it's available in the palm of their hand.
If you are an Office 365 Business Premium subscriber (which costs $12.50 per user per month), and use Microsoft Bookings, you can check out the new app. However you will need to opt into the beta. So this means you need to hit up the link below, before you are able to download the app and start using it. After you opt in, you'll be able to download the app and get started. If you're not interested in being part of the beta, you can also Pre-Register for the app on the Google Play Store. Keep in mind that this is a beta version of the app, so it might be a it rough, as far as user experience goes. But this is a great way for Microsoft to get feedback from their customers on the app, and improve it over time, before they make it available to everyone.