This article will walk you  thru on solving the mailbox error message listed below. The issue is related to a mailbox deleted items being full which can cause the calendar invites NDR to other user when scheduling the user for meetings.

“STOREDRV.Deliver.Exception:QuotaExceededException.MapiExceptionShutoffQuotaExceeded; Failed to process message due to a permanent exception with message Move/Copy messages failed”

The solution is listed in the MS article below for the issue listed below

Cancel calendar invitation gets bounce

Due to mailbox deleted items folder being full, you will need to enable  Auto Expanding Archive for making some extra storage and that can be done using the following command.

Enable-Mailbox <user mailbox> -AutoExpandingArchive ->

Enable-Mailbox user@domain.com -AutoExpandingArchive

See the reference article below from Microsoft

https://docs.microsoft.com/en-us/microsoft-365/compliance/increase-the-recoverable-quota-for-mailboxes-on-hold?view=o365-worldwide%3C/a

Thanks for reading this .