I saw a post on here about Outlook 2007 causing WordPerfect X3 to crash. I had the same problem with WP X3 and Vista Business 32 bit. I upgraded to WP X4 and the problem continued. I did a clean install of Vista Business x64 and all programs. The problem continues. If I read e-mail in Outlook, WP becomes unstable and crashes if I open a new blank document or close the last open document. Has anyone found a solution to this problem?