I notice that this problem has come up a lot but none of the suggested solutions seem to work for me so far. I am running windows vista and outlook 2007. It has been running fine for several years but suddenly won't open and I get the error message ' cannot open outlook window'. I have tried the 'outlook.exe/ resetnavpane' in the start search and then clicking on programme - it opens outlook but a completely new version with non of my contacts etc. Grateful for any ideas.