I have Windows Vista with WIndows Mail v6.0.6000.16386
I have several folders created with messages stored in them and all was OK up until today.
Now I found that all messages in any folders I created show "message cannot be found".
The Standard Inbox, Sent folders etc are OK.
How can I retrieve the important messages I need?

I had previously exported messages with all folders and tried importing onto another computer when I needed it to travel but none of the messages in the created folders came back.  Does this indicate a corruption or a problem with the program?

Any help appreciated.