If you forward a meeting invitation, Exchange will notify the meeting Organizer that the meeting notice has been forwarded, and to who it was forwarded. So, if you don’t want the Organizer to know that their meeting was forwarded, you can forward the meeting as an attachment.
Notes:
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When you forward a meeting request, it will not include the organizers name in the “To” or “CC” fields; however, there is a small note above the “To” section that says “When you forward this meeting, a meeting forward notification will be sent to the organizer.”
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If you look at the forwarded message (from your sent items), it does not show it was sent to the organizer; however, it does state in the From: Your Name on behalf of Person You Forwarded To.