I am developing a filing system for my company using Outlook 2003 vba. We are running an Exchange Server 2003. I am saving emails to our server as MSG files. I want to retrieve a unque ID from an incoming email to check whether it has been saved already. If an email is sent to several people within the company we don't want to store it more than once. Does anyone know how I could go about this, which ID property could I use? The ID would need to be retrivable from a saved MSG file and compared with the one within an email in someones inbox. Many thanks in advance.