Advice: New domain or join current domain

My company is placing a satellite company in Mexico and would like to know if it would be better to have a separate domain and add it to our domain or just add a domain controller to our current domain and have a different subnet? In both cases I am planning on having a domain controller on site but would like to know the pros and cons of having a separate domain or just add to our current domain.

Our domain is currently a 2003 domain but will be raising it to 2008 then 2012 but that will not happen before we move into Mexico.  The controller I will be putting in Mexico will be a 2012 server.
TimSr. System AdminAsked:
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Cris HannaConnect With a Mentor Commented:
Dos the "company" in Mexico require access to resources on the network that's running 2003?
Or vice versa?   If not...I'd just run them completely separate
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TimSr. System AdminAuthor Commented:
Yes, the company needs access to a terminal server, file server and IIS server on the same network. I will add the server to the domain as a secondary controller.

If I add a 2012 server to the domain as a secondary server will that cause any issues? I have two 2008 servers that serve as secondary domain controllers but don't know if a 2012 server will cause issues on the 2003 domain.
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Cris HannaCommented:
you can add 2012 to a 2003 domain but you should read up and make sure your domain controllers are very healthy
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cmlbaeteCommented:
If it was me and I had to do this when we opened a China branch create a site to site VPN and open add it as a new site with its own DC. That was if the DC fails in Mexico you won't lose all the AD as it will replicate with your main office. It worked well for us even with fairly low speed internet/VPN connection.
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Jian An LimSolutions ArchitectCommented:
if you upgrade your first DC from 2003 to 2008, then you can even deploy Read only DC.
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Cris HannaCommented:
Author agreed that the office in Mexico with the new install needed access to the resources in the main company domain and therefore would join the existing domain as recommended
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