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This blog is about mostly anything in IT. But the primary focuses are Microsoft Technologies like Exchange, Office 365, Azure and Cloud Security.

Public Folder Single Character Restore Phenomenon

When you delete a public folder using a legacy Outlook client, you can easily restore the deleted folder and it's content using the Recover Deleted Items function. 

Due to a fancy trick implemented in Outlook 2013 and Outlook 2016 the recovered folder will not be recovered using it's full name.

This phenomenon has been verified with Exchange On-Premises and Exchange Online on the server side and Outlook 2013/2016 and Outlook 365 ProPlus.

The following example uses public folders in Exchange Online and Outlook 365 ProPlus.

Example

In this example I will delete and recover a public folder named My Public Folder.

Public folder hierarchy before deletion

After deletion of My Public Folder and it's content, I need to select the original parent folder and click the Recover Deleted Items button in the button bar.

Select original parent folder

Recover Deleted Items

The Recover Deleted Items dialogue opens and we select the deleted item for recovery. The dialogue displays the original name of the deleted folder.

Recover Deleted Items (DE)

After recovering the deleted folder the folder is recovered with the first character only.

Recovered public folder with first character only

That's an annoying result in regards to customer self-care when users restore deleted items on their own behalf.

But wait, there is a solution available.

Solution

The solution requires today's primary administrative tool available: PowerShell.

Step 1

Get an overview of public folders currently located in the public folder dumpster

Get-PublicFolder –Identity “\NON_IPM_SUBTREE” –Recurse 

Name             Parent Path
----             -----------
NON_IPM_SUBTREE
[...]
My Public Folder \NON_IPM_SUBTREE\DUMPSTER_ROOT\DUMPSTER_EXTEND\RESERVED_1\RESERVED_1\65722859-3...
Sub Folder 1     \NON_IPM_SUBTREE\DUMPSTER_ROOT\DUMPSTER_EXTEND\RESERVED_1\RESERVED_1\65722859-3...
Sub Folder 2     \NON_IPM_SUBTREE\DUMPSTER_ROOT\DUMPSTER_EXTEND\RESERVED_1\RESERVED_1\65722859-3...
[...]

 

Step 2

Export the list of public folders currently located in the public folder dumpster and find the identity of the deleted public folder you want to recover

Get-PublicFolder –Identity “\NON_IPM_SUBTREE” –Recurse  | fl | Out-File D:\TMP\publicfolderdumpster.txt

publicfolderdumpster.txt excerpt:


RunspaceId                     : 6ce9588e-829b-4592-aedc-85f9a2e2c963
Identity                       : \NON_IPM_SUBTREE\DUMPSTER_ROOT\DUMPSTER_EXTEND\RESERVED_1\RESERVED_1\65722859-366a-4e0
                                 9-81fe-ea576ec7a6f7\My Public Folder
Name                           : My Public Folder
MailEnabled                    : False
MailRecipientGuid              : 
ParentPath                     : \NON_IPM_SUBTREE\DUMPSTER_ROOT\DUMPSTER_EXTEND\RESERVED_1\RESERVED_1\65722859-366a-4e0
                                 9-81fe-ea576ec7a6f7

Step 3

Recover the deleted public folder to the correct parent target folder

Set-PublicFolder –Identity "\NON_IPM_SUBTREE\DUMPSTER_ROOT\DUMPSTER_EXTEND\RESERVED_1\RESERVED_1\65722859-366a-4e09-81fe-ea576ec7a6f7\My Public Folder" –Path “\TestFolders” –Verbose

As a result the public folder is recovered with it's original name.

Notes

There are some other things to consider when recovering deleted modern public folders.

Public folders originally located in the hierarchy root are always recovered to the public folder mailbox holding the primary hierarchy. 

Public folders originally located in the hierarchy root will replace the permissions of child public folders when restored. 

More on these default restore behaviours can be read here.

Links

Nevertheless, enjoy modern public folders.

 

 



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