I am having a problem with downloading Office 2007 attachments (.docx, .xlsx) in OWA being saved as .zip.
I found an article on this site about adding MIME types for Office 2007 extensions into IIS6. I applied the fix and it is working for IE7 users. Everyone using IE7 can now download .docx files correctly. However, IE8 users are still having the problem.
We are running Windows Server 2003, IIS6, and Exchange 2003. All users have Office 2007 Pro installed.