I'm having problems with Entourage Mail and certain attachments. Sometimes, when trying to open either Word or Excel attachments, I get error messages stating either the file is in use or is an invalid file type. I know this is not true because I can switch into Apple Mail and open the attachment with no problem. I like most of Entourage's features and don't want to have to go back and forth between email clients, but this problem is really a pain. Any suggestions?