如果只是想实现子公司人员添加自己公司人员的邮箱,你可以通过做权限委派来实现.
假如需要做程序开发你可以到开发论坛上寻找答案，解决这类问题他们会更专业。
Development Forum:
http://social.technet.microsoft.com/Forums/en-US/exchangesvrdevelopment/threads/
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
