Windows AD Users

There was a domain called ABC.com (local domain), there were several users joined to this domain's AD. so they login to there windows machines using domain credentials.

Now those users were transferred together with there PCs, but without their Domain controller. So, they don't connect to AD server anymore to authenticate their login, but still use domain credentials to login.

Scenario is; this new PCs once connected to the ABC.com domain are needed to be connected to a new domain called XYZ.com (local domain). this new domain doesn't have any connection with ABC.com. I already added all the users details in to new AD (XYZ.com), but PCs are not yet joined.

I want to join these ABC.com previous domain PCs to XYZ.com domain simplest way and still want to retain the user data.

Example: John once worked for ABC.company so his login was;
                 user name: JohnD   -----------}        User Name: JohnDR (user loginname varies in the new AD, but same user)
                 Password  : S3cr3t  -----------} TO  Password   : n3ws3cr3t
                 Domain     : ABC.com --------}        Domain      : XYZ.com

so, when John comes tomorrow morning and logs into XYZ.com and should see no difference. he should not see any difference at all, except he is log into XYZ.com domain. he should have his familiar desktop, all the apps, and docs.

How can I achieve this task?

One more thing;
I have setup a web proxy (cache). it's 192.168.1.1:8080. I need to enforce proxy settings in internet browsers (IE, firefox, chrome, safari) from the windows 2012 server GPO.

How Can I do this?
Roshan LiyanabaduHead of OperationsAsked:
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Larry Struckmeyer MVPConnect With a Mentor Commented:
Safest way is to either safeguard the users data by backup of copying out of the existing profile, then be certain you have the local admin user name and password or some way to reset it, then disjoin from the old domain, join the new domain, then copy the user data back into the new profile.

There are various third party migration assistance utilities available.  One of the most frequently referenced is from Forensit, and for a limited number the utility is free.

http://www.forensit.com/
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Natty GregIn Theory (IT)Commented:
What Larry said, however if you had users with roaming profile you could transferred all there profiles in one go to the new server, so when they joined and log in there profiles would already be there
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Roshan LiyanabaduHead of OperationsAuthor Commented:
Your are correct, I had used this software before, but didn't think it would work in this scenario. but it worked.
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