Hi, I'm John! I will help you with this.
To help narrow down the issue:
- Could you share a bit more background, for example, was the account recently compromised or inactive for a long period?
- Also, do she know if her Outlook mailbox might have reached its storage limit before the emails went missing?
In the meantime, please check "Deleted Items" and "Archive" folders, sometimes older messages are automatically moved there.
Also try searching for a specific old email to see if it still appears.
If the issue persists, please provide more details by answering my questions.
Click "Add comment" below to let me know.
Regards,
John J.D.