split up domain

how do i split up domain
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jag-pensAsked:
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Glen KnightCommented:
Any more information?

What type if domain? What type of splitting up do you want to do?
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jag-pensAuthor Commented:
Sorry,

I was trying to do a search logged on through an rdp session (any way to run a lighter weight expertss exchange session?).

Anyways, main site all 2003 servers, primary and backup dc, 2003 exchange. One company (of two) leaving the premises and want to split completely (but that could change somewhere down the road...).  I'm not that worried about the data as the permissions can be redone relatively easily.  Rough numbers 120 users total split in two.  More concerned about Exchange than anything.  My gut says go with a new forest, then establish new domain for departing company, install fs and exchange, then move users over, but it's going to get messy...OWA and outlook anywhere users all over the place.  Remote site has single fs as bdc (again 2003)...

Thoughts?
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Glen KnightCommented:
Your right, the best bet is to start a new domain, especially as exchange is installed.
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NetfloCommented:
Probably suggest creating a new forest and domain for the departing company, possibly a longer route but that way there are no dependencies. Yes the OWA and Outlook Anywhere could get messy, however if you have multiple IPs that shouldn't be an issue, if planned correctly.

You can still allow both domains to talk to each other via domain trust temporarily while you are in migration. For Exchange providing users mailboxes are below 2GB, Exmerge should be okay and importing should be a breeze too.

Heads up for the existing users who may have dud cache entries in Outlook when sending to users in the new domain. Going forward if the two separate domains wants to talk in future this can be done, you could always establish a trust later and allow file access.

If both organisation upgrade to Exchange 2010, you can take advantage of Federation Services, which can allow calendar, contact and free/busy access across forests too.

Hope this helps.
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Glen KnightCommented:
If you split the domains (by taking a DC offline and seizing all the roles to it) there is a whole load if cleaning up required.  It's also unlikely you will be able to trust each other because it's the same domain (although I've never tried so don't know for sure)

What you are suggesting is frought with problems, no doubt unsupported if you ever run in to problems, and I woukd seriously recommend against it.

Setting up a new, clean domain is the best way forward.  I personally, wouldn't even be considering anything else because of the work involved in putting it right.
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jag-pensAuthor Commented:
To demazter,

Sorry, what exactly do you mean by "What you are suggesting is frought with problems"?
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NetfloCommented:
In other words, new domain and forest is the only way forward. Splitting the DCs and seizing the roles on both DCs to create two split networks is not the best way forward and you could end up with endless issues.
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Glen KnightCommented:
Well, any type of split of an existing domain for use by 2 different entities is going to cause problems with Acive Directory.

It's really not worth the hassle.
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jag-pensAuthor Commented:
Ok guys, thanks for your input!
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