[Evolution] Mail there but not visible

[John Adams <john mintra com>]

Hi

I am using evolution on Mandrake 9.1 and the inbox and outbox contents 
have become invisible. The mail is their as the number of unread mail 
boxes in brackets is there.

It is as if I had done a search for mail and excluded everything
I have had this before some time ago and I do not remember how it was 
solved.

John