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How to delete MAPI Permission if Remove-MailboxFolderPermission does not work

Hi All,

Today i helped a Collegue with an Exchange Online Folderpermission Problem. He could not remove the Permissions from a Mailbox Folder (MAPI Permission).

Get-MailboxFolderPermission -Identity email@domain.tld:\Kalender | fl


Let's remove the User (In fact a Mail Enabled Security Group)

Remove-MailboxFolderPermission -Identity email@domain.tld:\Kalender -User CH_DE_Room_Equipment_Reviewer

This resulted in the following Error:
Microsoft.Exchange.Management.StoreTasks.UserNotFoundInPermissionEntryException | There is no existing Permission entry found for user


I've grabbed MFCMAPI from Stephen Griffin.

First set some Options Tools > Options


Enable the two Options:
- Use the MDB_Online flag when calling OpenMsgStore
- Use the MAPI_NO_CACHE flag when calling OpentEntry


I've created an Outlook Profile and had FullAccess to that Mailbox.

Session > Logon


Selected that Outlook Profle



Selected the Mailbox


Selected the Top of Information Store > Kalender Folder
With the right click i opened the Context Menu and selected > other Tables > ACL Table


Here i was able to delete the Entry


Regards
Andres Bohren


Print | posted on Friday, December 30, 2022 2:48 PM | Filed Under [ Exchange ]

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