SymptomsAfter changing webmail on a domain from Horde to Atmail, webmail may become unavailable. The following error is added to the Event Log:
Log Name: System
Date: 6/4/2012 6:32:26 PM
Event ID: 1007
Task Category: None
The World Wide Web Publishing Service (WWW Service) did not register the URL prefix http://webmail.mydomain.com:80/ for site 6. The necessary network binding may already be in use. The site has been disabled. The data field contains the error number.