At ProtonMail, we’re grateful for our longtime paying subscribers. As a way to provide these users extra value and to say thanks, early subscribers have received extra storage for free. No action is required to benefit from the bonus storage.
The bonus storage can be used for ProtonMail and future products, such as ProtonDrive.
The bonus storage is permanent as long as your subscription is active. If you downgrade to a Free plan, you will lose the benefits, even if you decide to upgrade again in the future.
For multi-user ProtonMail Professional plans, users receive extra storage per account.