These simple steps show how to add a Exchange calendar on Android.
Requirements
The Exchange connection can be used for syncing your Exchange or Office 365 calendars. If you are having problems you can ask your system administrator if these requirements are met:
Install OneCalendar
Download OneCalendar from the store and install it on your device.
Goto OneCalendar Menu
Select the hamburger menu icon on the top left.
Select Accounts overview
Select the option "Accounts" in the menu.
Select Add account
Click on the "+" sign to add a new account.
Select Account type
Click on the "Exchange" account type.
Enter credentials
OneCalendar will try to autodetect your settings. This will not always work. If it fails, the following screen will be shown.