For me, Office program attachments showed the correct icon, but the pdf attachments did not show the pdf icon (it showed the icon that means there is no program associated with it). However, the pdf would still open as a pdf. Just the icon was wrong.

My solution was to go to a pdf file in Explorer (any file will work), right click, and choose "Open With" then "Choose Program" -- the last thing on the list. The Adobe Reader was selected, but the checkbox next to "Always use the selected program to open this kind of file" was not checked. I checked it. Outlook still showed the same icon. I closed Outlook and re-opened it, and voila, now pdf attachments show the correct icon! Hope that helps you.


Maybe this will work with Office documents as well if the icon is not showing properly. You have to go into a file of that type to do the "Choose Program". Always check the box.