The solution is fairly simple: log out of your account and log in using another account that has administrator permissions, then delete the Temporary Internet Files folder.
When you log back in using your own account, the folder will be recreated.
There are two new causes for this problem, although I'm not sure how common these two causes are, especially in Outlook 20 because it's only a problem when the default setting is changed.Voila - I could increase the disk space, and my Outlook would let me download pictures and actually see them.When pictures in your email won't download, even though you have Outlook configured to download external content (or allow it on a per-message basis), the problem is usually a "full" temporary file folder.It can also be caused by a secure proxy server, an invalid Temp folder path, or a corrupt Temporary Internet File folder.
Corrupt Temporary Files Folder (TIF) One cause of images not displaying in Outlook email is a corrupt Temporary Internet Files (TIF) folder (a second symptom is the TIF size is set to 0 in Internet Options).
This seems to be more common after IE is installed.