1.Sign into your computer with the same Windows username you use while checking your Outlook mail.

2.Press "Windows-E" to launch File Explorer or Window Explorer

3.Click an empty part of the address bar at the top of the file browser.

4.Type or paste the following into the address bar: C:\Users\%username%\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.Outlook\

5.Press "Enter." Windows displays one or more randomly named folders that contain your temporary Outlook files.

6.Double-click a folder to display any temporary files.

7.Right-click the files you want to delete, and then select "Delete" from the pop-up menu. Click "Yes" to confirm and send them to the recycle bin. Delete them from the recycle bin to remove them permanently.