Send & Receive Issues

Fix Outlook.com Mailbox Full After Deleting Emails

Kushani Nimanthika Sep 25, 2026 869 views

Question details

The user is unable to send or receive emails because their Outlook.com mailbox indicates it is full, even after they have deleted messages to free up space.

How to Fix Outlook.com Mailbox Full After Deleting Emails

Product: Outlook.com
Device & OS: not provided
Scenario: Attempting to send or receive emails when the account indicates the storage is full.
Observed behavior: The mailbox remains full after deleting emails, blocking new incoming and outgoing messages.

Before you start

Ensure you have your Microsoft account login credentials ready, as you will need to access your account dashboard online to review your combined cloud storage.

Solution 1Recommended

Clear Combined Microsoft Cloud Storage and OneDrive

Microsoft shares cloud storage across Outlook.com and OneDrive. You must clear space in both areas and empty their respective recycle bins to restore email functionality.

Because Microsoft cloud storage is shared between your Outlook mailbox and OneDrive, simply deleting emails may not be enough if your OneDrive is taking up the majority of your quota. You need to manage both to resolve the full storage error.

Access the Microsoft Storage Dashboard

Navigate to https://account.microsoft.com in your web browser and sign in with your Outlook account.

Review the Storage Breakdown

Locate the 'Microsoft storage' section to see whether Outlook attachments or OneDrive files are consuming your storage quota.

Empty Outlook Trash Folders

Open your Outlook.com mailbox, right-click on the 'Deleted Items' and 'Junk Email' folders, and select 'Empty folder' to permanently remove the deleted emails.

Clear OneDrive Storage

Click on the OneDrive icon in your storage dashboard, delete any unnecessary large files, and then navigate to the OneDrive Recycle Bin to permanently empty it.

Clear Combined Microsoft Cloud Storage and OneDrive

Storage Sync Delay: It may take a few hours for the Microsoft servers to update your storage quota and resume email delivery after you clear space.

Free Microsoft Office alternative

Manage Your Documents Locally with WPS Office

If your Microsoft cloud storage is frequently full due to heavy document files, consider saving and managing your documents locally using WPS Office. It's a lightweight, free alternative to Microsoft Office that offers full compatibility with Word, Excel, and PowerPoint files without forcing you into expensive cloud storage subscription plans.

1. Download and Install: Visit the official WPS website to download and install the free WPS Office suite on your computer.
2. Open Existing Files: Open your existing Microsoft Word, Excel, or PowerPoint files directly in WPS Office.
3. Save Locally: Save your files directly to your local hard drive or your preferred free cloud service, bypassing Microsoft storage limits.

Free up Microsoft cloud storage by managing and saving files locally.Fully compatible with Microsoft Office formats (.docx, .xlsx, .pptx).Lightweight installation that doesn't consume excessive system resources.Familiar, easy-to-use interface with a seamless migration process.

microsoft office alternative - wps office

Frequently Asked Questions

Why does my Outlook say storage is full when I deleted everything?

Microsoft combines Outlook.com and OneDrive storage into a single Microsoft Cloud storage quota. If your OneDrive is completely full, deleting emails in Outlook will not resolve the issue until you also clear space in your OneDrive account.

How long does it take for Outlook to recognize I cleared space?

It can take anywhere from a few hours up to 24 hours for Microsoft's servers to sync your new storage limits across all services and allow emails to be sent or received again.

Does deleting emails with large attachments free up space faster?

Yes. Emails with large file attachments consume significantly more storage space. Sorting your inbox by size and deleting those emails, then emptying the Deleted Items folder, is the most efficient way to reduce your mailbox size.

What happens to emails sent to me while my storage was full?

Emails sent to you while your storage was full will bounce back to the sender with an 'undeliverable' error. They are not queued or saved by Microsoft, so the sender will need to manually resend the email once you have cleared enough space.

Outlook & Email Problems