Hi,
Thanks for the responses so far, to answer the questions:
Permissions - i think i've checked just about every permission there is to check 3 times
All of the users on the new server are in a "technical" OU and most, if not all, are domain admins. The one user that it does work for does not have anything special about his AD acc as all technical staff are created from a technical template acc as far as permissions and membership goes. All acounts on the new server is in the same store, and new server is a member and the old the master.
What I am struggling to understand is why users are recieving the reminders for the meetings ok but not the initial request? Surely if the reminder is gettign delivered then the permissions etc must be ok an if one user is recieving the initial requests then the config of the servers must be correct?...