Outlook.com emails disappearing automatically – no rules found

Hello,

I am experiencing an issue with my personal Outlook.com mailbox where certain incoming emails disappear shortly after arriving.

I have personally observed messages appearing in Outlook Web and then disappearing without deleting or moving them myself.

Other messages arrive and remain in the mailbox normally.

Troubleshooting already completed:

• Checked Inbox, Junk Email, Archive and Deleted Items.
• Checked Recover Deleted Items.
• Reviewed inbox rules and Sweep rules.
• Confirmed that automatic forwarding is disabled.
• Disabled POP and IMAP.
• Checked connected applications and revoked unused permissions.
• Examined the Inbox Rules Table and Associated Contents Table using MFCMAPI.
• Found no unexpected rules.

My questions:

Could Outlook.com automatically remove certain messages without a visible inbox rule?

Are there any other places where hidden or server-side rules could exist?

Is there a way to identify what happened to messages that disappeared and cannot be recovered?

Are there any additional diagnostic steps available for personal Outlook.com accounts?

I would appreciate any technical guidance on investigating this issue.

Thank you.Hello,