Exchange 2010 - SP1 - Outlook 2010 If any user creates an all day appointemnt in a room mailbox and then creates another appointment (or another user), within that period. The second appointment is not declined by the auto attendant, although it is set to not accept conflicts. I have checked the AllowConflicts is set to false as shown below: [PS] C:\Windows\system32>Get-CalendarProcessing -Identity stanley | fl RunspaceId : 0d82fd7d-9250-4468-8169-aa3b2780d8a4 AutomateProcessing : AutoAccept AllowConflicts : False BookingWindowInDays : 180 MaximumDurationInMinutes : 1440 AllowRecurringMeetings : True EnforceSchedulingHorizon : True ScheduleOnlyDuringWorkHours : False ConflictPercentageAllowed : 5 MaximumConflictInstances : 0 ForwardRequestsToDelegates : True DeleteAttachments : True DeleteComments : True RemovePrivateProperty : True DeleteSubject : False AddOrganizerToSubject : False DeleteNonCalendarItems : True TentativePendingApproval : True EnableResponseDetails : True OrganizerInfo : True ResourceDelegates : {GroupGSA.local/Sydney/BSTSTU/Amie Lucas} RequestOutOfPolicy : {} AllRequestOutOfPolicy : False BookInPolicy : {} AllBookInPolicy : True RequestInPolicy : {} AllRequestInPolicy : False AddAdditionalResponse : False AdditionalResponse : RemoveOldMeetingMessages : True AddNewRequestsTentatively : True ProcessExternalMeetingMessages : False RemoveForwardedMeetingNotifications : False MailboxOwnerId : GroupGSA.local/Contacts/Stanley Identity : GroupGSA.local/Contacts/Stanley IsValid : True Please advise as to how I can stop conflicts being acceptedVista Ultimate Dell XPS M1330