Storage issues

Question

My outlook keeps telling me I am out of storage. Yet I have used 5.5Gb of 100GB. Contacted support and they told me to use this and were very unhelpful.

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

The warning is most likely not about the 100 GB email mailbox quota, but about Microsoft unified/cloud storage (OneDrive + Outlook.com + other services) or a different mailbox/archive that is full.

Key points from the documented behavior:

1. Outlook.com and Microsoft 365 consumer mailboxes can be up to 100 GB
   • Email storage can be well below 100 GB (for example, 5.5 GB used of 100 GB) and still be fine from a mailbox perspective.
   • However, consumer mailbox limits are capped at 100 GB; going beyond that is not possible without moving to enterprise plans.
2. “Microsoft Unified Storage is full” or similar messages refer to cloud storage, not just email
   • If Microsoft storage (unified cloud storage) is exceeded:
     • Cannot send or receive email in Outlook.com, even if the email storage quota itself is not exceeded.
     • OneDrive becomes read‑only for existing files and cannot upload/sync new files.
     • Teams messages with attachments cannot be sent or received.
   • This can cause Outlook to show storage/full warnings even when the mailbox usage (5.5 GB of 100 GB) looks fine.
3. If email storage itself is exceeded
   • Sending and receiving email in Outlook.com stops.
   • Incoming messages are returned to the sender until storage is reduced.
4. Ways to resolve storage warnings
   • Check both:
     • Email storage usage (mailbox size) in Outlook/Outlook.com.
     • Microsoft storage (OneDrive + Outlook.com + other services) usage.
   • To get back under quota:
     • For free accounts: either buy a Microsoft 365 subscription to increase quotas or free up storage using the storage management tools.
     • For Microsoft 365 subscribers: mailbox is capped at 100 GB; to clear warnings, free up storage (delete or move mail/files) if unified storage is full.
5. Typical causes when mailbox looks small but warnings persist
   • OneDrive or unified storage is over its quota even though the mailbox is not.
   • Old or secondary Microsoft accounts still holding data and triggering “storage exceeded” notices.
   • Archive or other folders still counting toward mailbox quota until items are permanently deleted (including emptying Deleted Items/Trash).

In practice, resolving this usually involves:

• Verifying unified Microsoft storage usage (not just the mailbox figure) and freeing space there if over quota.
• Permanently deleting unneeded mail (including from Archive and Deleted Items) if email storage is high.
• Ensuring the warning is not tied to a different/older Microsoft account that still has full storage.

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References:

• Mailbox storage limits in Outlook
• Storage limits in Outlook.com
• Microsoft storage FAQs