First we need to grab the resource mailboxes only. When you  have kept the default mailbox size than your ProhibitSendQuota should be 490 MB.  We can grab Room and Equipment mailboxes in once when we filter for the ProhibitSendQuota :

Make sure that you see only resource mailboxes and the output contains all resources you expect.
If you are pleased with the result in the output run the following from the ISE or Powershell :

We just have granted AvailabilityOnly rights to the Default user. ( showing free / busy information )

The second Method to grab the resource mailboxes would be to filter for the RecipientTypeDetails parameter. Please keep in mind that the value of this parameter can be different since a resource mailbox can be a RoomMailbox or an EquipmentMailbox. The filter must be set accordingly, I recommend to run it on both types :

Same again , when the output looks like expected, replace the red part ( one after the other ) with the red part in the script.

To use this on user mailboxes verify the output of the following command and replace the command below with the red part in the script above:

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A user makes a new meeting request and sends it to a resource mailbox. The meeting will be placed  in the calendar of the user and in the calendar of the resource mailbox. The status in the resource calendar stays tentative.  Some minutes later the same user wants to delete the meeting ( for whatever reason ).

Because he is not the delegate / owner of the resource mailbox he just can cancel the meeting in his own calendar. The result is that the canceled meeting stays in the resource calendar just labeled :  canceled.

This comes because the AutomateProcessing Parameter within the Get-CalendarProcessing CMDlet is set to AutoUpdate. AutoUpdate places the meeting in the calendar of the resource mailbox and updates it to tentative. On the other hand the cancel request will not be processed with AutoUpdate, instead just the owner of the resource mailbox can remove these canceled meeting requests from the calendar.

To remove canceled meeting requests from the resource mailbox calendar we need to modify the AutomateProcessing parameter :

Setting the AutomateProcessing parameter to AutoAccept will place the meeting requests as accepted meetings in the calendar and will process the cancelation requests for meetings directly , without any intervention of the owner. This keeps the resource calendar clean and transparent.

First we need to know the values of following CalendarProcessing Parameters :

To allow users to remove canceled meeting requests these parameters should have the following values :

The values can be adjusted as follows :

To use it in a 2010 MultiTenant environment replace -OrganizationalUnit with -Organization.
To use it on an OnPremise server just leave -OrganizationalUnit or Organization away.

Your users will now be able to remove canceled meeting requests from a resource calendar.

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