Assume that you are using Microsoft Outlook in online mode in a Microsoft Exchange Server 2010 environment and you perform one of the following actions:
You try to move a folder to a target folder that contains a folder that has the same name.
You try to delete a folder so that the folder is moved to the Deleted Items folder. However, the Deleted items folder contains a folder that has the same name as folder that you want to delete.
In this situation, the operation fails. The moved or deleted folder still exists in the original location. However, Outlook does not display an error message to indicate the failure.
If you try to move the folder by using the Outlook Web App (OWA), you receive the following error message:
The folder couldn't be moved or copied. A folder with the same name might already exist.
If you try to delete the folder by using the OWA, you receive the following error message:
The folder couldn't be deleted. This may have occurred because a folder with the same name already exists in the Deleted Items folder.
This issue occurs because the Exchange Server 2010 server does not return the appropriate error code to Outlook. Therefore, Outlook does not detect the operation failure.
To resolve this issue, install the following update rollup:
2746164 Description of Update Rollup 6 for Exchange Server 2010 Service Pack 2
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the ecDuplicateName error code (0x80040604), go to the following Microsoft website: