问题描述：

过lync图形界面进行lync扩展的时候出现如下错误：

未将对象引用设置到对象的实例

………………………………………………………………………………………………………………………….

原因分析：

查询资料给出如下解释：

The Enable-CsAdForest Lync Server command is designed to run from the Active Directory Domain Services forest root domain for security purposes. If the pre-existing RTC Universal security groups do not exist in the Active Directory Domain Services forest root domain the Enable-CsAdForest Lync Server command will fail with an error that is similar to the one listed in theSymptomssection of this article.

参考资料：

http://social.technet.microsoft.com/Forums/zh-CN/827804c1-690b-45c3-93d8-426c66a9a82c/forest-preparation-failed-lync-2013-std-object-reference-not-set-to-an-instance-of-an-object

http://support.microsoft.com/kb/2549544

解决方法：

3、 当前环境AD林扩展用图形界面是不能成功的，需要用命令加参数来完成于是输入如下参数


Enable-CsAdForest -GroupDomain contoso.com -GlobalSettingsDomainController DC02.contoso.com -GroupDomainController DC02.contoso.com -GlobalCatalog DC02.contoso.com Verbose

扩展成功