Dears, Kindly need your help as i have Room Mailbox with below configuration: RunspaceId : d1330328-5356-4f7d-bcf0-b804979164b3 AutomateProcessing : AutoAccept AllowConflicts : False BookingWindowInDays : 180 MaximumDurationInMinutes : 1440 AllowRecurringMeetings : True EnforceSchedulingHorizon : True ScheduleOnlyDuringWorkHours : False ConflictPercentageAllowed : 0 MaximumConflictInstances : 0 ForwardRequestsToDelegates : True DeleteAttachments : False DeleteComments : False RemovePrivateProperty : False DeleteSubject : False AddOrganizerToSubject : True DeleteNonCalendarItems : False TentativePendingApproval : False EnableResponseDetails : False OrganizerInfo : True ResourceDelegates : {} RequestOutOfPolicy : {} AllRequestOutOfPolicy : False BookInPolicy : {} AllBookInPolicy : False RequestInPolicy : {} AllRequestInPolicy : False AddAdditionalResponse : False AdditionalResponse : RemoveOldMeetingMessages : True AddNewRequestsTentatively : True ProcessExternalMeetingMessages : False RemoveForwardedMeetingNotifications : False MailboxOwnerId : contoso.com/Conference Rooms/ConfRoom1 Identity : contoso.com/Conference Rooms/ConfRoom1 IsValid : True AutoAccept enabled, when organizer create new meeting but meeting conflict with other one organizer get declined mail but attendants still can take action on it also decliend notification not sent to attendants. Thanks in advance, TarekThanks & Best Regards Tarek Mostafa Kamel MCSE, MCTs - SharePoint, MCTs - Exchange, MCT tmk_emy_mcse@hotmail.com