Outlook Calender Invites forwarding to other users

[Seryth]

Hi, we're currently having an issue where anytime a domain user creates a Calender Meeting in Outlook 2003 and then tries to Invite other users to the meeting, their invitation is automatically forwarded to other users in the domain who are then asked to respond on behalf of the original user. It appears that this was set up in the past, but due to confusion with Out of Office assistants and such we want to remove it, any idea where the setting to change this is located?

Thanks!