Adding domain name to active directory

We are on a Windows 2008R2 domain and would like to change or add another domain name to it. Our current domain name is examplemain, but we recently acquired example.com and would like our AD to reflect that. Is there an easy way to add it to co-exist or do we need to rename it?

Thanks
OrbusLLCAsked:
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David Johnson, CD, MVPOwnerCommented:
you would have to do an ADMT migration to take effect on domain accounts, for external users and external facing endpoints there is not much of a problem.
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