I’m adding this Q/A because I just stumbled upon this limitation
today,and I was not able to find any documentation about it; there
is an old KB article about this issue,but it’s currently not
indexed by Google (probably because it was published years ago and
never updated),and the issue is never mentioned elsewhere.
是否可以在父域中创建一个与子域名相同的OU？
是否可以创建与父域中的OU同名的子域？
解决方法
不,如果OU位于父域中的根级别,则无法执行此操作(如果OU位于子树中,则不会出现问题).
参考：http://support.microsoft.com/en-us/kb/240147.
知识库文章很老,只提到了Windows 2000,但从Windows Server 2012 R2开始,这个限制仍然适用.
奇怪的是,the official guide about Active Directory naming conventions没有明确提到这个问题：它只是说你甚至在删除冲突的项目之后也会遇到它,因为拖延的逻辑删除对象.