Would like to "collapse" a trusted domain

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Hello,
Due to acquisitions we would like to bring over the user accounts from the
merged companies' domain, over to our domain ... we already have a domain
trust and are able to attach to their DCs, etc ... I have 2 questions:

1st question.) Is there any easy way to get their user accounts, and create
them on our domain ... there's about 500 user accounts that I don't want to
create one by one.

2nd question.) Please review the below ... and if there's something I'm
missing, please state on the reply ...

These are the steps I plan to present to the execs:
• Demote all stand alone servers from the “their” domain, and promote them
to the “our” domain. All major applications (e.g. SQL, etc) will need to be
re-associated by servername.ourdomain.
• This portion is the longest part of a domain collapse: Creating user
accounts on “our” domain for all end users over at “their” domain.
Disconnecting their email account from “their” domain user accounts, then
reconnecting their current email account to their newly created account on
“our” domain. We will have to demote all of the computers from the “their”
domain, and then promote them to “our” domain. Once this is done, each user
over at “their” domain will need to begin to use their user accounts from
“our” domain to login on their computers. As they are successful with their
login attempts on “our” domain, we can disable and not delete their accounts
on “their” domain. We will then need to copy all of their local files from
“their” domain user profile over to the newly created “our” domain profile on
each of their local machines.
• Once all of the steps above are complete, tested, and we are satisfied
that all users are logging into “our” domain, and that all of the “their”
applications and servers are working properly as a member of “our” domain,
only then can we demote the 3 domain controllers on “their” domain.

Thanks,
Frank

.

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