OneNote Storage Error

Question

My OneNote and OneDrive keep telling me it cannot sync or backup because I am out of storage. I have only used 10.9GB out of 1 TB of storage. What is actually full is the free 5GB. I am logged into the correct account. If I click the get more storage or help or anything, it takes me to my account where the available storage shows. I have uninstalled, reinstalled, logged out and back in many times. NOTHING is fixing it and I am getting quite angry at this point and very much considering just cancelling the stupid subscription and going back to the free service my school offers. This is ridiculous.

Answer 1

Hello Gabriella,

I realize that you've encountered a problem with OneDrive storage. I truly understand your confusion. Let me assist you further.

For me to provide the most accurate solution, would you please let me know few information about the situation you're experiencing:

1. What’s the exact error text + any error code shown in OneNote (e.g., 0xE0000796, “Quota Exceeded”, “Out of space”, etc.)?
2. Which OneNote app are you using on Windows: OneNote (desktop/M365) or OneNote for Windows 10 (Store app) — and what version/build?
3. Where is the affected notebook stored: OneDrive Personal, OneDrive for work/school, SharePoint, or local only — and does it fail on all notebooks or only one?
4. On this PC, are you signed into more than one Microsoft account anywhere (Windows account, OneDrive, Office apps), and does the OneDrive sync client show 5GB full while OneDrive on the web shows 1TB?
5. Does your Microsoft account show any other storage warnings (e.g., https://outlook.live.com/mail/ mailbox / OneDrive recycle bin / “Microsoft storage” banner), and have you recently changed/renewed your Microsoft 365 plan or joined/left a Family subscription?

Once I have this information, I will be able to assist you better. I am looking forward for your respond.

Answer 2

The error is caused by the Microsoft unified storage quota, not by the 1 TB OneDrive-only quota.

Microsoft uses a unified cloud storage pool that includes:

• OneDrive files
• Outlook.com mailbox and attachments
• Other Microsoft 365 data

When the message says the free 5 GB is full, it means the unified storage portion is over quota, even if OneDrive itself shows plenty of space remaining (for example, 10.9 GB used out of 1 TB). In this state:

• OneNote cannot sync notebooks stored in OneDrive or SharePoint.
• OneDrive and other apps report that storage is full.

Effects of “Microsoft Unified Storage is full”:

• Cannot upload, edit, or sync new files to OneDrive; existing files become read-only.
• Cannot send or receive email in Outlook.com, even if the mailbox itself is not over its own limit.
• Cannot send or receive Teams messages with attachments.

To resolve this, it is necessary to get back under the unified storage quota by doing one or more of the following:

1. Delete unneeded files from OneDrive (including large files and the Recycle Bin).
2. Clean up Outlook.com mailbox (large messages, attachments, Junk, Deleted Items, etc.).
3. If using the free tier, purchase a Microsoft 365 subscription or additional storage.
4. If already on Microsoft 365 Personal or Family, optionally add more file storage on top of the included 1 TB.

Once the unified storage usage drops below the quota (or additional storage is applied), sync and backup for OneNote and OneDrive will resume. Note that it can take up to 24–48 hours for quota changes and storage clean-up to fully propagate across the account.

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References:

• Microsoft storage FAQs
• Resolve the 0xE0000796 (Quota Exceeded) error in OneNote
• Fix issues when you can't sync OneNote
• I'm getting a "Disk full" message in OneDrive