email account says it is full, but storage shows 15.3 gb out of 100gb used

Question

only 15.3 gb out of 100gb of storage used on my account, but email says it is full

Answer 1

Hi, I'm John! I will help you with this.

To help narrow down the issue:

1. Could you please check your storage directly on the OneDrive website and confirm what it shows there? Here is the link: https://onedrive.live.com/managestorage
2. After freeing space (or purchasing additional storage), it can take up to 24 to 48 hours for everything to fully update across your account. I’d recommend waiting that time and check again OneDrive after that.

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Also, a couple of quick things to verify:

• Check if your Recycle Bin in OneDrive has items in it (those still count toward storage)
• See if your storage is being taken up by Outlook email attachments, as Outlook and OneDrive share the same storage quota
• Confirm you’re signed into the same Microsoft account on all devices

If the update is still pending after 24 hours, you can try unlinking and relinking your OneDrive account, or resetting it. "Unlink and re-link OneDrive" https://support.microsoft.com/office/unlink-and-re-link-onedrive-3c4680bf-cc36-4204-9ca5-e7b24cdd23ea

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If the issue persists, please provide more details by answering my questions.

Click "Add comment" below to let me know.

Regards,

John J.D.

Answer 2

Outlook.com shows two different but related limits:

1. Email (mailbox) storage
2. Microsoft cloud (unified) storage shared across OneDrive, Outlook.com attachments, and other Microsoft 365 apps

Even if the mailbox shows only 15.3 GB used out of 100 GB, the account can still be blocked from sending/receiving mail if the unified cloud storage is full.

When Microsoft storage is exceeded:

• Sending and receiving email in Outlook.com is blocked, even if the email storage quota itself is not exceeded.
• Uploading/editing/syncing new files to OneDrive is blocked and existing files become read-only.
• Teams messages with attachments are also blocked.

To resolve the “account is full” message in this situation:

1. Check overall Microsoft storage usage (cloud/unified storage), not just mailbox usage.
2. If the free 5 GB Microsoft storage is exceeded, either:
   • Free up space by deleting files (for example from OneDrive or large email attachments stored in cloud storage), or
   • Buy/upgrade a Microsoft 365 subscription or additional storage to increase the cloud storage quota.
3. After the account is back under the unified storage quota, Outlook.com mail sending/receiving will resume.

If instead the email storage itself is full (not the case in the numbers given, but for completeness):

• Outlook.com will block sending/receiving and return messages to senders until enough mailbox space is freed.

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References:

• Storage limits in Outlook.com
• Microsoft storage FAQs