Check your Microsoft storage first, because a full Outlook.com or cloud-storage quota stops both sending and receiving email.
1. Check mailbox storage
- In Outlook.com, open Settings.
- Search for Storage, then open the mailbox storage page.
- If it is full, delete large messages and empty Deleted Items and Junk Email.
- Sign out, sign back in, and send yourself a short message without an attachment.
Messages sent to you while storage was full are returned to the sender and cannot later be recovered automatically. Outlook.com also will not send an attachment larger than 25 MB.^1^
Also check Drafts and Outbox for a stuck message. Remove any large attachment, then resend it or share it as a OneDrive link.^2^
2. Restore the folders and old-message view
If the folder list itself is missing:
- Maximize the browser window.
- Select the three-line menu on the left to expand the folder pane.
- If the pane still does not appear:
- Sign out of Outlook.com.
- Clear the browser cache.
- Close every browser window.
- Reopen the browser and sign in again.
These are Microsoft’s documented steps for a missing Outlook.com folder pane.^3^
If folders appear but old messages do not:
- Select Filter above the message list, then choose All.
- Select Filter → Sort → Date.
- Check Other, Archive, Junk Email, and Deleted Items.
- Open Settings → Mail → Rules and look for rules moving or deleting messages.
- Check whether email forwarding is enabled.^1^
To recover deleted mail on a computer, open Deleted Items and select Recover items deleted from this folder. Select the messages and choose Restore. Items removed from Deleted Items are recoverable for 30 days; this recovery view is unavailable in a mobile browser.^4^
3. Separate an account problem from a browser problem
Open Outlook.com in a private/incognito window or another browser.
- Works there: the original browser’s cache or an extension is likely interfering. Clear its cache and temporarily disable extensions.
- Still fails there: check Microsoft’s Service Health Status site from the Outlook.com known-issues page. That page also lists current fixes and workarounds.^5^
If you recently changed your Microsoft account password, update it where Outlook requests it. Unusual sign-in activity can also temporarily block the account.^1^
4. Escalate if the mailbox still does not update
In Outlook.com, select Help, describe the send and folder problems, and complete the suggested troubleshooting. If unresolved, scroll to Still need help? and select Yes to contact Outlook.com support.^1^
Include:
- The exact error shown when sending.
- Whether a test message remains in Drafts/Outbox or produces a delivery-failure notice.
- Whether the problem also occurs in a private browser window.
- Whether storage shows available space.
- Whether the folders exist but are empty, or the folder pane itself is missing.
References
- Can't send or receive email in Outlook.com | Microsoft Support
- Email stuck in Outlook.com | Microsoft Support
- Working with message folders in Outlook.com | Microsoft Support
- [Web](https://support.microsoft.com/outlook/mail/recover-and-restore-deleted-items-in-outlook)
- Fixes or workarounds for recent issues on Outlook.com