They could have been moved to any other folder like Junk or Archives.Ideally, if your emails keep disappearing from Outlook, then it could be because of these causes. Too often, it can become a persisting situation in which emails would disappear from Outlook regularly. There are times when Outlook users are not able to find their emails or even folders. Part 4: How to Protect Your Outlook Emails?.Part 3: What If Recovered Emails are Corrupt in Outlook?.Part 2: How to Recover Missing Emails from Outlook?.Part 1: Why Emails Disappear from Outlook?.