"Use it well, Leo," the message read. "But remember: nothing is truly free. Next time, just ask the student help desk. They have vouchers."

If you are a student or educator at an eligible institution, you can get the desktop versions of the apps for free.

Finding a legitimate is nearly impossible because Microsoft 365 is a subscription-based service that activates through a Microsoft account, not a traditional 25-digit code. Most "free key" lists found online are either expired, unauthorized volume licenses, or potential security risks.

“The key you seek isn’t behind a wall of ads,” the post read. “It’s hidden in the code of the first letter I ever wrote. Look for the ghost in the machine.”

This feature would be a useful resource for Microsoft 365 users, making it easier for them to manage their product keys and activate their subscriptions.