merging domain names

We have a a Domain name that differs from the our email address scheme. They sopuld be the same. Can anyone show me how to make them the same? I would ratger change the domain name in Active Directory so we all dont have to change email addresses. Thanks.
dolphan757Asked:
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Rajith EnchiparambilConnect With a Mentor Office 365 & Exchange ArchitectCommented:
You can rename the domain, but it involves a lot of work for no benefit whatsoever.

http://www.petri.co.il/windows_2003_domain_rename.htm
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Xenus99Commented:
You can do it through RUS, update your RUS with the correct address to get all users updated.
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bob_the_builderCommented:
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
As long as your internal ad domain name is not something that another company owns (like microsoft.com), you don't have to change it.

You can have yourcompany.local as your internal ad domain and yourcompany.com as your emailaddress. That is how everyone works and Exchange can handle it.

Why do you want to change anyway?
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dolphan757Author Commented:
Today is only my second day. Our internal domain name is totally different from echange. i.e. comapnyzero.local (domain) and user@comp0.com (exchange). I want to change the domain name to match the exhcnage because we have business cards and everything else published with the exchange naming convention. We only have once DC. Whats the easiest way to do this? What are the repercussions?
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
having company.local and user@company.com as email address is fine. there is nothing wrong in it. To be frank, that is how it should be.

What are you trying to say in ""we have business cards and everything else published with the exchange naming convention"""??

Why do you want to give your internal domain details in your business card? Can't understand..
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dolphan757Author Commented:
the company's internal domain name is tsidomain.local , the company email address scheme is tecsysint.com I want to make the domain name tecsysint also.
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dolphan757Author Commented:
what are the repercusions?
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