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Subscriptions
Subscriptions shows you what software you are licensed to access as per your subscription, and any add-ons that have been added to your user account. Click on the Subscriptions link in the left navigation bar or click on the View subscriptions button in the Subscriptions block to get to the page:
When you click on this option, you'll see the following page:
Once you're on this page, you will be able to see all of your licensed software.
Just because you have a license to access it doesn't mean you can access it easily or at all. If you don't see an application on your app switcher but you can see that you have a license to it, you should contact your Office 365 Administrator.