Hi Danny,
Thanks for the post.
In general, If all users and services can be managed in a single enterprise domain, there is no need for trust relationships. If the domains for main and branch office are parent and child domains, the domain trust are established automatically.
So I am wondering if the two offices belong to the different forests.
As for how to create a forest level trust relationship, you could refer to the following articles:
Preparing for a forest level trust in Windows Server 2003
Creating a forest level trust relationship in Windows Server 2003
Hope this helps.
Miles
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