A shared mailbox cannot have it's deleted elements actually deleted. Neither on OWA nor on the apps. Moving files to junk folder as a desperate attempt to have them flushed out only resulted in a duplication of said files. When i go to the deleted elements to remove them there is just a loading time but they remain. The recoverable items are empty, Just a thought but it sounds as if this account was on litigation hold, but i have no idea where to see this or remove it. Thanks for your input.

Litigation hold will not cause such behavior, most likely the recoverable items subtree is full. How did you check for that? Use the following cmdlet: Get-MailboxFolderStatistics username -FolderScope RecoverableItems | ft Name,Folder*Size,Items* The FolderAndSubfolderSize value on the top entry therein is what you should be looking at.

Shared mailbox : Deleted elements can't be deleted.

Accepted answer

Vasil Michev 111.6K Reputation points MVP

2024-12-03T18:02:07.52+00:00
Litigation hold will not cause such behavior, most likely the recoverable items subtree is full. How did you check for that? Use the following cmdlet:

Get-MailboxFolderStatistics username -FolderScope RecoverableItems | ft Name,Folder*Size,Items*

The FolderAndSubfolderSize value on the top entry therein is what you should be looking at.
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ChristyZhang-MSFT 24,971 Reputation points Microsoft Vendor

2024-12-04T05:16:42.2133333+00:00

Hi @Christophe Cervello (FLAIR-IT) ,

Just checking in to see if above information was helpful. If it is useful, would you mind marking the helpful post as an answer? Which would benefit others who also has similar issues in forum.

Christophe Cervello (FLAIR-IT) 25 Reputation points

2024-12-04T13:21:59.5666667+00:00

Hello, it is helpful but i am being bloqued by a lack of permission. So i ll give a new feedback once i have gotten access to the required elevated rights. ( issue is that the Get_MailboxFolderStatistics is not allowed on my admin account, tried the Get-EXOMailboxFolderStatistics cmdlet as well with same issue ). Thanks and looking forward ot provide a feedback and most likely more help :) . (got the rioght level of permission as i wrote that)

Christophe Cervello (FLAIR-IT) 25 Reputation points

2024-12-04T13:28:40.5433333+00:00

Well, indeed there are a lot of stuff in those : @Vasil Michev :

What would be then the way to remove these recovefrable Items for exemple? in Outlook they simply don't show up.

And thanks for the help Michev.

Vasil Michev 111.6K Reputation points MVP

2024-12-04T17:20:21.67+00:00

Unfortunately, cleaning up is a painful process, especially when the mailbox is on hold. You will have to follow the instructions in this article: https://learn.microsoft.com/en-us/purview/ediscovery-delete-items-in-the-recoverable-items-folder-of-mailboxes-on-hold?view=o365-worldwide

Probably the best way to approach this is to find out why is the hold needed and whether it's possible to reduce its duration (or remove it altogether). You can also try running the Start-ManagedFolderAssistant cmdlet to hopefully free up some duplicate items:

Start-ManagedFolderAssistant mailboxname -HoldCleanup

Apart from that, you will have to follow the steps in the article above to delete 10 items at a time... which can take a while.
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Shared mailbox : Deleted elements can't be deleted.

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