Outlook mailbox corrupted – emails disappear and not visible in any folder

Question

I am experiencing a serious issue with my Outlook (Hotmail) account.

Emails are being received, but they do not appear in any folder (Inbox, Junk, Deleted, Archive) and cannot be found via search.

I can open emails directly if I click on them, but they are not assigned to any folder. When I move emails to Inbox, they disappear completely.

This issue occurs across different browsers and also in private/incognito mode, so it is not a browser or cache issue.

I have checked all rules, filters, junk settings, and folders, and there are no rules causing this behaviour.

This suggests my mailbox index or Inbox folder is corrupted.

I am concerned I may be missing important emails due to this issue.

Please can a Microsoft moderator escalate this to the backend team to repair or reindex my mailbox.

Answer 1

Hi Matt Carter,

Welcome to Microsoft Q&A forum. 

I understand how concerning this is, especially if emails are being hidden from the message list and you may miss important messages.

To narrow this down, could you please share these three quick details:

• Does the issue happen only on Outlook.com on the web (outlook.live.com), or does it also happen in Outlook mobile / Outlook desktop (New/Classic)?
• When the emails “disappear,” do you see them in Focused/Other, Archive, Deleted Items, or under Deleted Items > Recover items deleted from this folder?

Once I have this information, I can advise on the next steps.

---

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Answer 2

Based on the described behavior (messages exist and can be opened, but are not visible in Inbox/Junk/Deleted/Archive, and moving them to Inbox makes them disappear), the issue is most likely related to hidden filtering, rules, or view issues on the mailbox rather than a browser problem.

Perform the following checks in Outlook.com (web):

1. Check filters on the message list

• At the top of the message list, select Filter.
• Change the selection to All so no filter (Unread, To me, etc.) hides messages.

2. Check rules that might move or hide messages

• Go to Rules settings in Outlook.com.
• Review all Inbox rules and Sweep rules and look for any that:
  • Move messages to unexpected folders (including custom folders), or
  • Delete or archive messages automatically.
• Disable or delete any rule that could be moving new mail away from Inbox.

3. Check Junk and Archive behavior

• Open the Junk Email folder and verify that messages are not being misclassified. If they are, select a message and choose Not junk > Not junk.
• Open the Archive folder and confirm messages are not being auto-archived. If you find messages there, select them and choose Move to > Inbox.

4. Confirm no view/filter is applied in Outlook desktop (if used) If the same account is configured in Outlook for Windows or Mac:

• Select the affected folder (for example, Inbox).
• On the View tab, select View Settings > Filter.
• On each tab (Tasks, More Choices, Advanced), clear any conditions that could hide items (such as only showing unread, specific dates, or specific senders).

5. Check for missing items due to view filters If items disappear from a folder immediately or after a consistent time, this is typically caused by a filter in the folder’s default view. Removing or resetting the filter/view will make the items visible again.
6. If the problem persists If all filters and rules are cleared and messages still:

• Can be opened but show no folder location, and
• Disappear when moved to Inbox, then the issue is likely on the service side.

In that case, use Outlook.com’s built‑in support so the issue can be escalated and investigated on the backend:

• In Outlook.com, select Help on the menu bar.
• Enter a brief description of the problem (for example, “Messages not visible in any folder; disappear when moved to Inbox”).
• If self‑help does not resolve it, scroll down to Still need help? and choose the option to contact support.
• If sign‑in is not possible at any point, use the dedicated sign‑in help link from the Outlook.com support page.

This path reaches the Outlook.com support team, who can check for mailbox‑level corruption, indexing issues, or hidden folder problems and repair or reindex the mailbox if needed.

---

References:

• Email is missing from your Outlook.com inbox
• Items disappear or are not visible in an Outlook folder
• Outlook.com folders disappear or go back to a previous name