After you use the Exchange Server CD-ROM to remove the Exchange Server services, and after you remove all of the registry keys that are associated with Exchange Server in accordance with the following Microsoft Knowledge Base article
259158�
XADM: How to Manually Remove Exchange Server 5.5 Completely
if you attempt to delete the Exchsrvr folder, you cannot delete the folder and you receive the following error message:
No new event ID messages are logged in the System event log or Application event log. You can delete all of the subfolders in the Exchsrvr folder except the Webdata folder. If you attempt to delete the Webdata folder, you receive a "SHARING VIOLATION" error message.