Ever wonder what characters are valid in domain names, netbios names, Active Directory sites, etc? Well you don’t have to guess, Microsoft has a knowledgebase article with the standards already defined for you.
Pay special attention to name collisions in the directory and the reserved words when defining OU names.
http://support.microsoft.com/kb/909264
For more information contact us at www.webactivedirectory.com, or call us at (+1) 800-747-3565