This problem does not affect new public folders, only old ones that have probably been on Exchange 2000/2003 servers in the past. Migrations I believe did go smoothly but now have errors. Error Reported is: -------------------------------------------------------- Microsoft Exchange Error -------------------------------------------------------- The following error(s) occurred while saving changes: Add-PublicFolderClientPermission Failed Error: Failed to modify the MAPI.NET table property of the object "000000001A447390AA6611CD9BC800AA002FC45A030064004E9CC2F8DD46B5E1E4578DE6D8030000000278E90000" on server "FQDN.Server.Name". See inner exception for more information. MapiExceptionNonCanonicalACL: Unable to modify table. (hr=0x80004005, ec=2409) Diagnostic context: Lid: 40487 EMSMDBMT.EcDoRpcExt2 called [length=218] Lid: 56871 EMSMDBMT.EcDoRpcExt2 returned [ec=0x0][length=356][latency=0] Lid: 23226 --- ROP Parse Start --- Lid: 27962 ROP: ropModifyACL [64] Lid: 17082 ROP Error: 0x969 Lid: 27745 Lid: 21921 StoreEc: 0x969 Lid: 27962 ROP: ropExtendedError [250] Lid: 1494 ---- Remote Context Beg ---- Lid: 26426 ROP: ropModifyACL [64] Lid: 22086 Lid: 27128 Lid: 27232 StoreEc: 0x8004010F Lid: 27128 Lid: 27232 StoreEc: 0x8004010F Lid: 22086 Lid: 21970 StoreEc: 0x8004010F PropTag: 0x3D210102 Lid: 19149 Error: 0x0 Lid: 24509 Error: 0x0 Lid: 31229 Error: 0x0 Lid: 21970 StoreEc: 0x8004010F PropTag: 0x668F0040 Lid: 6671 StoreEc: 0x8004010F Lid: 24976 Lid: 24952 Lid: 25472 Lid: 7972 StoreEc: 0x969 Lid: 26532 Lid: 4920 StoreEc: 0x969 Lid: 5119 StoreEc: 0x969 Lid: 5247 StoreEc: 0x969 Lid: 17916 StoreEc: 0x969 Lid: 4814 StoreEc: 0x969 Lid: 1750 ---- Remote Context End ---- Lid: 26849 Lid: 21817 ROP Failure: 0x969 Lid: 29150 Lid: 20446 StoreEc: 0x969 -------------------------------------------------------- OK -------------------------------------------------------- From ExFolders we get error "Exception: Object Reference not set to an instance of an object" Any thought on how to fix permissions, people who already had permission in the past can see and access them OK and all objects, but we cannot change/update or remove permissons We alos receive similar error from the powershell.

What happens when you assign the permission manually?Gulab | MCTS-MCITP: 2007 | MCTS-MCITP: 2010 | Skype: gulab.mallah

Hi, Could you please add a new public folder hierarchies with ADSIEdit as following setups. For how to use ADSIEdit ,you can access: http://technet.microsoft.com/en-us/library/cc773354(WS.10).aspx 1.Run ADSIEdit, right click Exchange Administrative Group under “Configuration \ services \ Microsoft Exchange \ Organization name \ Administrative groups”. 2.Select New Object. 3.Select msExchPublicFolderTreeContainer for the class and click Next. 4.Enter the following for the value: Folder Hierarchies, click Next. 5.Click Finish. 6.Create Public Folder Tree Object. 7.Right click CN=Folder Hierarchies -> New Object. 8.Selected msExchPFTree for the class. 9.For the value we entered, "Public Folders" and clicked next. 10.Clicked on the "More Attributes" button, selected msExchPFTreeType . 11.Set the value to 1. Note: This is very important that this value is set to a value of 1 as This tells Exchange that this is a MAPI Tree. 12.Click Ok and then finish. 13.We then went to the properties of the newly created "Public Folders" Tree object in ADSIEdit. 14.Copy the distinguished name value to the clipboard and then click cancel. 15.Navigate to the Storage group that contains the Public Folder Store for this server and get properties of the server. 16.Locate the msExchOwningPFTree attribute and paste in the value that was copied from the Public folders Distinguish name attribute. 17.Restart the Information Store Service. 18.Mounted and dismount the PF store. 19.Open Outlook with administrator,give full permission to default owner. Hope it can help you!

I have the same problem, solution of Jerome Xiong is not working for me.