On the next screen, enter your Office365 password and click Next.Type in your email address, tick the checkbox next to “I agree to the Spark Terms of Use and Privacy Policy” and click on the “Next” button.Click on “Start using Spark” on the welcome screen.If you’re already using Spark and want to add a Office365 account, follow these instructions here instead. If you haven’t already, download and install Spark mail app on your Mac to get started.