A couple of weeks ago, Microsoft released the first in a series of 10 Microsoft PowerApp Templates that demonstrate how to make PowerApps that integrate with Office 365 Products and Services. My team and I are thrilled to be working on the team that is building them with Microsoft! You can read more about this series of PowerApps on the PowerApps team blog.
The first PowerApp in the series is the Out Of Office PowerApp. It allows you to set your Out Of Office message, decline conflicting events, and send calendar invites to notify people of your absence.
Here is a video of the functionality the Out Of Office PowerApp provides. Keep an eye on my blog and YouTube channel for deep dive development videos on this PowerApp and the others we are currently working on!