Outlook.com mailbox displaying incorrect message bodies after delivery – possible content index corruption

Question

I’m experiencing what appears to be mailbox content/index corruption in my Outlook.com (Hotmail) account.

Issue description:

• New incoming emails briefly display the correct content.

After a few seconds (without refreshing), the message body changes.

The body is replaced with an old sextortion spam email that I previously received.

The message header (sender, subject, timestamp) remains correct.

There is no bounce, no forwarding, and no new email created.

The replaced content is always the same old spam template message.

Important details:

This occurs in Outlook on the web and in the Outlook desktop app.

I have changed my password.

MFA is enabled.

All rules, sweep rules, forwarding, and connected accounts have been removed.

No suspicious sign-ins appear in account activity.

Local malware scan is clean.

This does not appear to be an active compromise. It looks like the body of a previously received spam message is being incorrectly rendered over new messages.

Given that rules cannot modify message bodies, I suspect mailbox index/database corruption.

Can a technician:

Reindex my mailbox

Reset the mailbox database

Or escalate this to the Outlook.com backend team for mailbox repair?

I can provide additional diagnostic details if needed.

Thank you.

Answer 1

I've just fixed this for a customer I had. Ended up being a hidden rule as many have suspected.

The fix for me was to add the compromised account to a full featured version of Outlook. I used Outlook (classic).

NOT the version of Outlook which is pre-installed.

Then run the following command in Run (WIN +R)

outlook /cleanrules

EDIT: First step should be to remove consent for Thunderbird and Microsoft Graph at the following link: https://microsoft.com/consent

Also, remove any email forwarding which shouldn't be there, reset passwords, add 2FA, remove any email forwarding which shouldn't be there.

Answer 2

Hi L M,

Welcome to Microsoft Q&A.

Since this reproduces across web + desktop and you’ve already ruled out rules/MFA/malware, the key next step is to prove whether the server is returning the wrong body or the client UI is rendering the wrong body.

Quick checks

1. Forwarding test (to Gmail/iCloud)

• Forward one of the “corrupted” messages to an external mailbox.
• If the recipient gets the correct body, it’s likely a display/render/conversation-mapping issue.
  • If the recipient gets the spam body, that suggests the stored/served message content is wrong and needs deeper investigation.

2. Grab raw evidence from one “swapped” email

• Copy the Message-ID from the message headers/details and note whether the raw/source body is the new email or the old spam template.

For reference: View internet message headers in Outlook

3. Turn Conversation view OFF in Outlook on the web and retest (threading can mix bodies).

For reference: View email messages by conversation in Outlook

4. Optional (diagnostic only): reproduce once in InPrivate/Incognito to rule out local browser/app storage.

Contact Support

Unfortunately, there isn’t a forum-side “reindex/reset mailbox” button for Outlook.com.

If this persists, please use Outlook.com > Help > Still need help? > Contact support so it can be escalated with mailbox traces.

Please let me know if this proves useful to you or if you would like assistance in navigating Microsoft's support channel.

I'm looking forward to your reply

Answer 3

It sounds like you're experiencing a complex issue with your Outlook.com mailbox where the content of new emails is being incorrectly displayed. This could indeed be related to some form of content index corruption, especially since you mentioned that the message headers remain correct while the body displays old spam content.

Unfortunately, the context provided does not contain specific guidance on reindexing mailboxes or resetting mailbox databases for Outlook.com. Typically, such actions would need to be handled by Microsoft support or a technician with access to the backend systems.

Since you've already taken several steps to secure your account and eliminate potential causes, I recommend reaching out to Microsoft support directly for assistance. They can provide the necessary tools and support to investigate and potentially resolve the issue with your mailbox.

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References:

• Unintentional emails received in Outlook
• Terminated in error found in Outlook Sync Issues log files
• Messages occur when connecting to Office 365 email account