It took me a few minutes to figure it out so I thought I’d share how it’s done.

• Open a web browser to https://Portal.MicrosoftOnline.com.
• Log in to your Office 365 with an account that has the necessary administrative credentials.
• After logging in, click the Admin dropdown in the upper right corner and select Exchange.  (See  Fig. 1 below).

How To Find Your PC's Windows Product Key So You Can Reinstall Windows