An empty encrypted folder remains on a computer that is running Windows Vista after you move the folder to a network share
You have a folder that is encrypted by the Encrypting File System (EFS) feature on a computer that is running Windows Vista. When you move the encrypted folder to a network share that is not encrypted, the folder and the files that are contained in the folder are moved successfully. However, an empty encrypted folder that has the same name as the encrypted folder remains on the source computer.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB978175.