How to delete Exchange folder using Powershell or otherwise

Question

One of our test domain M365 accounts has accumulated a large number of items in the \Deleted Items Exchange Online Folder. From OWA Trash and Recoverable Items for the user are clean.

This seems to be causing most of the Exchange APIs we are using to grind to a halt.

I'm looking for some advice on how to actually clean-up not just the items but also the folders in \Deleted Items. For removing the items we have been able to adapt some of the instructions in https://learn.microsoft.com/en-us/exchange/policy-and-compliance/recoverable-items-folder/clean-up-deleted-items?view=exchserver-2019 to clean-up items in folders that are also under Deleted Items. We have also tried the Graph API, but it is not able to see any of these folders.

We are at a loss on how to delete the remaining folders which are now empty.

Thank you for your help!

Answer 1

Some options to delete folders:
https://community.spiceworks.com/topic/2181078-powershell-delete-a-folder-from-all-mailboxes-exchange-online-o365

https://www.slipstick.com/developer/outlook-delete-subfolders/

https://community.spiceworks.com/topic/2018825-powershell-office-365-delete-content-folders-of-a-mailbox

https://www.alitajran.com/delete-folder-in-exchange-online-from-all-mailboxes/

Answer 2

Thank you @Andy David - MVP

The first link - https://community.spiceworks.com/topic/2181078-powershell-delete-a-folder-from-all-mailboxes-exchange-online-o365 was helpful. Once I adapted the script to use OAuth (EWS basic auth is now disabled), I was able to get that to work. Folders are now deleting.

Did not try the other suggestions since they required local binaries that I could only get on a Windows machine.

Answer 3

Add-type -assembly "Microsoft.Office.Interop.Outlook" | Out-Null
$oLFolders = "Microsoft.Office.Interop.Outlook.OlDefaultFolders" -as [type]
$outlook   = New-Object -ComObject Outlook.Application
$namespace = $outlook.GetNamespace("MAPI")
$deleted   = $namespace.Folders.Item('******@domain.com').Folders.Item("Deleted Items")
cls
while(1){
    $deleted.Folders | %{
        Write-Host $_.Name -fore Magenta
        $_.Folders | %{
            Write-Host "	"$_.Name -fore Cyan
            $_.Delete()
        }
        $_.Delete()
    }
    cls
}

I am using this, and it's quite effective.
I am also pointing this to the Archive, which is "Online Archive - ******@domain.com"