Users receive "does not accept meetings longer than 1440 minutes" with MaximumDurationInMinutes set to 0

Question

Hi everyone,
We are running on Exchange 2007.  I have a user who is attempting to book a meeting on a calendar and is receiving the error, "Your meeting request was declined. This resource does not accept meetings longer than 1440 minutes."  I know
this is related to the "MaximumDurationInMinutes" property returned from Get-MailboxCalendarSettings in the Exchange Management Shell.  This value is currently set to 0, which I understand to mean unlimited.  The user did not experience
this issue with other meetings and there are several meetings scheduled that exceed this limit.  I have included the results of "Get-MailboxCalendarSettings" and the email response (with some identifiable information removed) below.  Does
anyone have any idea why this error might still be occurring and where it would pull the 1440 minute time limit from if it is not set? 
AutomateProcessing : AutoAccept
AllowConflicts : True
BookingWindowInDays : 180
MaximumDurationInMinutes : 0
AllowRecurringMeetings : True
EnforceSchedulingHorizon : True
ScheduleOnlyDuringWorkHours : False
ConflictPercentageAllowed : 0
MaximumConflictInstances : 0
ForwardRequestsToDelegates : True
DeleteAttachments : True
DeleteComments : True
RemovePrivateProperty : True
DeleteSubject : False
DisableReminders : True
AddOrganizerToSubject : False
DeleteNonCalendarItems : True
TentativePendingApproval : True
EnableResponseDetails : True
OrganizerInfo : True
ResourceDelegates : {}
RequestOutOfPolicy :
AllRequestOutOfPolicy : False
BookInPolicy : {domain.com/Core/Groups/Group}
AllBookInPolicy : False
RequestInPolicy :
AllRequestInPolicy : False
AddAdditionalResponse : False
AdditionalResponse : <DIV><FONT size=2
face=Tahoma></FONT></DIV>
RemoveOldMeetingMessages : True
AddNewRequestsTentatively : True
ProcessExternalMeetingMessages : False
DefaultReminderTime : 15
RemoveForwardedMeetingNotifications : False
Identity : domain.com/Enterprise/Service
Accounts/Service Account
IsValid : True
ObjectState : Unchanged
And the returned message:
Message ID : <[email protected]>
Sent Date : Thu, 2 Oct 2014 09:16:02 -0500
From : [email protected]
Sender MailID : [email protected]
Reply To : [email protected]
To : [email protected]
Subject : Declined: Meeting
------------------------- Contents -------------------------
BEGIN:VCALENDAR
METHOD:REPLY
PRODID:Microsoft Exchange Server 2007
VERSION:2.0
BEGIN:VTIMEZONE
TZID:Central Standard Time
BEGIN:STANDARD
DTSTART:16010101T020000
TZOFFSETFROM:-0500
TZOFFSETTO:-0600
RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=1SU;BYMONTH=11
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:16010101T020000
TZOFFSETFROM:-0600
TZOFFSETTO:-0500
RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=2SU;BYMONTH=3
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
ORGANIZER;CN=Sara Luckie:MAILTO:[email protected]
ATTENDEE;PARTSTAT=DECLINED;CN=Calendar:MAILTO:[email protected]
COMMENT;LANGUAGE=en-US:Your meeting request was declined.\n\nThis resource
does not accept meetings longer than 1440 minutes.\n\n _____\n\nSent by Microsoft Exchange Server 2007\n
SUMMARY;LANGUAGE=en-US:Declined: Meeting
DTSTART;TZID=Central Standard Time:20141215T080000
DTEND;TZID=Central Standard Time:20141219T173000
UID:040000008200E00074C5B7101A82E00800000000E066FB5521DECF01000000000000000
010000000D93B3AD93730E647B8C7A1B864C90BD3
CLASS:PUBLIC
PRIORITY:5
DTSTAMP:20141002T141602Z
TRANSP:OPAQUE
STATUS:CONFIRMED
SEQUENCE:1
LOCATION;LANGUAGE=en-US:Online Meeting\, N
Y
X-MICROSOFT-CDO-APPT-SEQUENCE:1
X-MICROSOFT-CDO-OWNERAPPTID:-784160802
X-MICROSOFT-CDO-BUSYSTATUS:TENTATIVE
X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY
X-MICROSOFT-CDO-ALLDAYEVENT:FALSE
X-MICROSOFT-CDO-IMPORTANCE:1
X-MICROSOFT-CDO-INSTTYPE:0
END:VEVENT
END:VCALENDAR

Answer 1

Hi Derek,
I find related information as below:
The default options allow all users to book resources if they are within the set policies (i.e. up to 180 days in the future, up to 1440 minutes in duration, etc.), and will reject all other meetings. In the context of resource mailboxes,
InPolicy and OutOfPolicy simply mean whether or not the meeting invitation matches any restrictions enabled on the resource mailbox. For example
MaximumDurationInMinutes value for the resource mailbox is 30 minutes, any meeting invitation longer than 30 minutes would be considered OutOfPolicy. Using the
RequestOutOfPolicy parameter, you can manually add users that are allowed to request meetings that are not within the policy, and if you really want to lock things down, you can set the
AllBookInPolicy value to False, and then manually add users to the
BookInPolicy field, or more restrictive, to the
RequestInPolicy field.
More details to see:
http://blogs.technet.com/b/exchange/archive/2007/05/14/3402515.aspx
I suggest set the MaximumDurationInMinutes parameter to a big number. Find a similar thread for your reference:
http://social.technet.microsoft.com/Forums/exchange/en-US/63ea54a2-6f18-4ff3-9f4d-239342d97081/need-to-remove-the-1440-minute-24-hour-limit-booking-on-all-the-conference-rooms-to-be-unlimited?forum=exchangesvradminlegacy
Thanks
Mavis Huang
TechNet Community Support