If you have a message with a picture whose filename contains a "blank" and
you right-click on the picture and select "save" the "blank" is replaced by
"%20", trivial you might say. It's tedious to rename them when saving.

As in all previous versions if you have an email with a picture attachment
with a filename containing "%20" (or any "%" code) the picture will not
display on preview or upon opening, as this bug spreads eventually NO
pictures will display in OE because most will contain %20 codes.

As I save MANY pics from emails this was enough for me to uninstall IE7 and
I can't even report the bug!