I have a new Toshiba laptop running Vista with Windows Mail. My old Dell Laptop is now a paperweight. ZAES version:

On ocassion, some of the junk e-mail that comes thru the filters of Windows Mail and ZAES can not be "junked" by ZA. I click and click on the "junk" button and the e-mail is unaffected and resides until I click on the Delete button. I'd rather Junk these as comapred with deleting.
Any idea on what may be happening and what to do?