Cannot delete legacy mailbox on Exchange 2010 - Access is Denied

Issue

Some mailboxes on Microsoft Exchange 2010 cannot be deleted via Exchange Management Console. Following error is displayed:

Active Directory operation failed on <domain controller>. This error is not retriable. Additional information: Access is Denied. Active directory response: 00000005: SecErr: DSID-033520B4, problem 4003 (INSUFF_ACCESS_RIGHTS), data 0

The affected mailboxes seem to be those that were moved during Exchange Upgrades from Exchange 2003 > 2007 > 2010.

Backup Exec was unable to prepare Microsoft Active Directory resources for Granular Recovery Technology (GRT) operations (V-79-57344-38747)

Issue

Backup Exec Server 16 (V-Ray Edition), running on Windows Server 2008R2 logs following warning after backing up Windows Server 2016 Domain Controller:

V-79-57344-38747 - Backup Exec was unable to prepare Microsoft Active Directory resources for Granular Recovery Technology (GRT) operations. Therefore you will be unable to perform GRT-enabled restores of Microsoft Active Directory data from this backup.

Enable Anonymous Relay on Exchange 2016

• Open Exchange Admin Center and Navigate to Mail Flow > Receive Connectors
• Create a new Receive Connector with following settings:
  • Role: Fontend Transport
  • Type: Custom
    

Backup live data using PowerShell, DiskShadow, and RoboCopy

Robocopy is my go-to tool for quick file-level backups. Unfortunately it doesn't deal well with locked files (live databases, pst files, etc.). In those instances I deploy another great tool - DiskShadow that allows to tap into functionality of Volume Shadow Copy Service (VSS). 

This is the way it works:

• diskshadow creates a shadow copy of a volume and then mounts it as a normal physical drive.
• robocopy then does its job by copying data from that mounted virtual drive without having to worry about locked files.
• Once copying is done dishshadow deletes the shadow copy and dismounts the drive.
• PoweShell sends notification and logs to your email.

Let's start:

• We'll need to create 4 files:
  • diskshadow_backup.conf - Main diskshadow backup file.
  • diskshadow_delete_x.conf - Used only to delete abandoned X: drive.
  • robocopy_backup.cmd - robocopy backup script.
  • run_backup.ps1 - PowerShell script to combine everything and then send logs via email. Executed manually or via scheduled task.