Remove Ghost Emails from Outlook
If the above method did not work for you, there is another way to fix a corrupted PST file.
Close Microsoft Outlook if it is open. Click the Start button, click Computer, double-click the hard disk drive (C:) and navigate to this folder:
Within the Outlook folder, right-click Outlook.pst and select Copy. Click the Back arrow button from the menu bar at the top left side. Right-click the Outlook folder and select Paste.
Double-click the Outlook folder to open it. Rename the original Outlook.pst file to Outlook1.pst. Rename the Outlook.pst you just copy and pasted and name it Outlook2.pst.
Open Microsoft Outlook. The first thing it will do is search for the PST file. It won’t be able to find it, so a message displays on the screen asking which PST file you want to use. Select the Outlook1.pst file. It will then display the same message for the ghost PST. Select the Outlook2.pst file.
Click the File tab at the top of the screen, and click the Info tab from the menu. Click the Account Settings tab, and then click Account Settings again. Click Data Files and you will see the two PST files. Right-click the second PST file, and click Close to remove the file. Restart Microsoft Outlook and the ghost emails should be gone.