Changing Windows internal domain name
If a company's name changed, can the internal Windows domain simply be renamed?
Or should we keep the previous domain name and add an additional domain name?
What will happen with the workstation profiles and profile-data connected to the previous domain name?
I want to follow the least disruptive route possible ...
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See https://support.microsoft.com/en-us/kb/300684
Adding an additional domain is not exactly problem free either as you'll have to consider trusts, complication of permissions etc. and if you make it a child domain the FQDN will still contain the old name.
Neither option is to be undertaken lightly.
Some light reading for you (!):
https://technet.microsoft.com/en-us/library/cc738208(v=ws.10).aspx
https://technet.microsoft.com/en-us/library/cc816631(v=ws.10).aspx
http://blog.varonis.com/risks-renaming-your-domain-in-active-directory/