Sending, receiving, and organizing email in Outlook.com
Hello, thank you for reaching out to Microsoft Q&A.
With a Microsoft account (Free one), you get 5GB of OneDrive cloud storage and 15GB of Outlook e-mail storage.
Based on your description, it appears you have an active Microsoft 365 Basic subscription, which includes 100GB of OneDrive and 100GB of Outlook email storage.
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If you cancel the subscription, the limits will be reduced from 100 GB to 5GB for OneDrive and from 100 GB to 15GB for Outlook email storage.
You can sign in with your account here to check how much storage you've taken up:
https://outlook.live.com/mail/0/options/accounts-category/storage
- If you no longer want the subscription, go to https://account.microsoft.com/services and sign in with your Microsoft account.
- Find your Office 365 Subscription in the lists, click Cancel subscription.
- Follow the prompts, then select "I don't want benefits" to proceed with canceling the subscription.
Reference:
Cancel a Microsoft 365 subscription
Note - If you cancel your subscription, your storage limit will be reduced. If you exceed the limits, you will need to free up storage in OneDrive or Outlook.
Let me know if you still need more help.