By mistake the internal Active Directory domain was named as an Internet domain that the company does not own. Exchange 2010 was installed and runs fine internally. The problem is now they need to send/receive external emails. They want to keep their email accounts using the internal domain, should I rename the forest AD or do I have another options.
Answer
Obvioously you won't be able to receive email from the outside that are addressed from a domain that you don't own, but you should be able to simply setup a real domain, and configure Exchange to accept messages for the new real domain in addition to the domain you have. If someone else is really using that fake domain, then you will not be able to send email to them.
It will be important to make sure that your accounts use the real address as default so, messages sent to external parties will appear to be valid, and people can reply to you.
In the long term, you should seriously consider renaming the forest. It is really not a good idea to be using a domain, that doesn't belong to you.
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