Two-way transitive trust - need to know whats required to turn into a forest-level trust


I have a two-way transitive, external trust with another domain, we want to turn that into a forest trust.
What do I need to do, do I create a new forest trust then remove the old two-way trust, do I upgrade the existing two-way trust somehow.
I need to know the method that will pose the least amount of risk to our customers using the trust for enterprise services.
I am new to deal with a forest level trust and need some guidance.  
Thanks in advance.
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Will SzymkowskiSenior Solution ArchitectCommented:
You cannot simply update the external trust to a forest trust. The only thing you can do is remove the current External Trust (domain) and create a new Forest Trust to the other forest.

Thats it


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dv8angelAuthor Commented:
Can I create the Forest trust and then remove the external trust, or should I expect to plan a minimal outage while I'm destroying one and creating the other.  Thanks!!
Will SzymkowskiSenior Solution ArchitectCommented:
Personally to avoide any issues, i would remove the current external trust and then create your Forest Trust.

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