I use auto-archiving to a file called archive.pst. I have one mail folder that apparently has the same archive settings as all the others, but the messages in it never seem to be moved either when auto-archiving, or manually archiving. Some are now about 2 years old, though auto-archiving is set for ages over 2 months. I know that the age of an item can be more recent than the date it was sent, but most of these messages have definitely not been looked at for a long time.

Any ideas?