I have a few resource calendars in Exchange Server 2013 CU 9 environment which have suddenly stopped processing the meeting requests.

My question is: how should i troubleshoot this problem?

There are 5 resource calendars that have stopped working. And many, many recource calendars that works normally. The resource calendars are located on different databases and on different mailbox servers.

Calendarprocessing settings are:

AutomateProcessing                  : AutoAccept
AllowConflicts                      : False
BookingWindowInDays                 : 730
MaximumDurationInMinutes            : 1500
AllowRecurringMeetings              : True
EnforceSchedulingHorizon            : True
ScheduleOnlyDuringWorkHours         : False
ConflictPercentageAllowed           : 0
MaximumConflictInstances            : 0
ForwardRequestsToDelegates          : True
DeleteAttachments                   : True
DeleteComments                      : True
RemovePrivateProperty               : True
DeleteSubject                       : True
AddOrganizerToSubject               : True
DeleteNonCalendarItems              : True
TentativePendingApproval            : True
EnableResponseDetails               : True
OrganizerInfo                       : True
ResourceDelegates                   : {}
RequestOutOfPolicy                  : {}
AllRequestOutOfPolicy               : False
BookInPolicy                        : {}
AllBookInPolicy                     : True
RequestInPolicy                     : {}
AllRequestInPolicy                  : False
AddAdditionalResponse               : False
AdditionalResponse                  :
RemoveOldMeetingMessages            : True
AddNewRequestsTentatively           : True
ProcessExternalMeetingMessages      : False
RemoveForwardedMeetingNotifications : False

I have also moved tested to move these mailboxes to different databases but it don't solve anything.

I didn't find any CRA logs about these mailboxes.

Also these mailboxes are below quota limits.

It feels like that there is something broken in these resource calendars or it is a bug in CU 9.

I just don't know how to continue troubleshooting this problem. I have tried to find for hours similar cases from internet but there are not many cases exactly like this.

• Edited by Petteri Heino 21 hours 9 minutes ago

What happens with the requests? Are they actually received/visible in the mailbox?