Microsoft to do

Hello

To avoid misunderstanding, are you saying this to-do item is self-generating, like spam? If so, there's a chance your account is compromised, and there's an active session signed in somewhere on a different device generating this. I suggest that you go through these items thoroughly. Some may not yield result until you wait at least 24 hours.. so please be patient.

Please complete these steps on a computer, not on a smartphone or tablet.

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First, go to https://www.outlook.com and sign in.

Click the gear icon in the top right corner to open Settings.

Under Mail, review the following areas:

Rules

If any rules are listed, delete all of them.

Conditional formatting

If anything is set up there, delete it.

Forwarding and IMAP

If you see any entries or settings you did not create, remove them. Turn off POP and IMAP.

Junk

Review Safe sender and blocked list. If you don't recognize any, remove them.

After that, exit Settings and return to outlook.com.

Open the To Do section by clicking the blue checkmark icon on the left side. Delete anything there that was not created by you.

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Go to https://account.live.com.

Under Your info > Sign-in preferences, review all aliases on the account. If you see any alias you do not recognize, remove it.

Next, go to the Devices section of your Microsoft account and remove any devices you do not recognize.

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Please also do the following in Security section

Change your password

Enable two-step verification

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Go here https://account.microsoft.com/privacy/app-access Click on "Don't allow" for anything you don't recognize.

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Then go to Security > Manage how I sign in and make sure all contact information belongs to you.

On that same page, scroll down to App passwords and remove any existing app passwords.

Also on the same page, click on Sign out everywhere. This is intended to disconnect any active sessions that may still be connected. Please note that this can take up to 24 hours to fully take effect.

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This did not work I have tried it several times

The message in Microsoft To Do is caused by mailbox or cloud storage being full, because To Do stores tasks in the same mailbox used by Outlook.com.

To resolve it:

1. Check Outlook.com mailbox storage
   • Sign in to Outlook.com in a browser.
   • Open Settings → View all Outlook settings → General → Storage (or use the Manage Outlook.com storage entry point if shown).
   • Review which folders are using the most space (Inbox, Sent Items, Deleted Items, etc.).
2. Empty Deleted Items correctly
   • Go to the Deleted Items folder in Outlook.com.
   • Select Empty folder.
   • At the top of the Deleted Items folder, select Recover items deleted from this folder.
   • In that view, select Empty folder again.
   • If there are many items, wait with the browser open until the deletion completes; if it fails, delete in smaller batches.
3. Reduce mailbox and cloud storage usage
   • Permanently delete large or old emails (especially with large attachments) from Inbox, Sent Items, and other folders.
   • Remove or clean up large attachments stored in Outlook.com that count against the shared 5 GB Microsoft cloud storage (OneDrive, Outlook.com attachments, Microsoft 365 apps).
   • Optionally, download important attachments locally before deleting the emails.
4. Recheck To Do
   • After freeing space, allow some time for changes to sync.
   • Open Microsoft To Do again and verify that syncing now works and the error no longer appears.

If storage is still near its limit after cleanup, consider further reducing cloud storage usage as described in the linked “How to reduce your cloud storage” and “How does Microsoft storage work?” articles in the references.

References:

• Why did I get a 'ran out of storage space' message in Microsoft To Do?
• Cannot empty the Deleted Items folder in Outlook.com