Merge three domains into one

We have three domanis with different ip address schemes.  Each domain has its own File Server, Mail Server, Domain Controller, Dhcp Server, Dns Server.  What i need to know is how can we merge these three domains into one.  What is the best way to do this.  Especially with the Dhcp Servers and ip address scheme.  Should we just use one address scheme or not why.
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thur6165Connect With a Mentor Commented:
You can probably keep the addressing the same, don't need to be on the same subnet to be on the same domain.   How many computer we are talking on each domain?  The best way to do a migration of this sort is to create a new domain and migrate over to it, that way it doesn't have to be a over the weekend thing.  Alot less stressful too.  And in some situations you can't have downtime so its your only option.
NolanDorsettAuthor Commented:
the three domains combined we have about 500 computers
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