New staff management app build

I would like to design a new app that works along with Microsoft calander and helps to keep track of staff, it will need to show whether they are at work, on holiday,working off-site or off sick. This also helps the health and safety and operations of all company's. You will be able to apply for leave and get it approved by you manager. This also will integrate with MS to show you are at appointments or in meetings. This will also be use for the role call in the case of an emergency. This app will also need to be able to be used as a in out board with a click of a button.