Office 2007 Mime Types (for IIS)
If you can't upload documents of type Office 2007 to your Windows server you might want to check if IIS allows Office 2007 mimetypes! In my case I was running Windows Server 2003 and IIS 5.6.
Use this guide to correct the problem: http://www.bram.us/2007/05/25/office-2007-mime-types-for-iis/
Keywords: Mimetype, docx, xlsx, Office 2007, IIS 5.6, uploading office documents, Windows 2003 Server.