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    UID field in iCal files - unique per-event or per-user or both?

    Hello, I want to create an iCal file for a corporate event and send it as an attachment in Outlook 2010 to 1000 users. In the definition of the iCal file there is a field called UID which needs to be unique. I'm trying to understand if it only needs to be unique for each event, or if it needs...