Forcing forestprep and domainprep to install Exchange.

My question is pretty simply.  I want to run forest prep and domain prep but can't because currently I have an orphaned DC.  It may be a week or so until that DC will be connected to my main DC and it really is crucial that I install Exchange and therefore extend the schema's as needed.

I thought when I took a class on exchange there was a way to force it?  Anyone know of this?  Also is it ok to force it?  Once the orphaned DC comes back on online won't it replicate the changes correctly?

Thanks much!
cendrizziAsked:
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czcdctCommented:
You can do the forestprep and domainprep so long as the box that is offline isn't one of the FSMO roles (SM, IM, DNM, RIDM) and even then it's the Schema Master that's key. You will either need to sieze the SM role onto another DC or wait.
You haven't said why this DC is offline though.
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cendrizziAuthor Commented:
The other one should have not have any notable role.  I guess I will double check to make sure.  

It's offline because it's at another office that has yet to be connected via vpn (and may not for some time longer).
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czcdctCommented:
Then for safety's sake I would either bring it back and plug it in or tear it out of AD and pretend it didn't exist.
You've only got between 60 and 120 days to connect it anyway, afterwhich it will be useless. http://support.microsoft.com/kb/311078 might be of help to you in the future and http://www.google.co.uk/search?hl=en&q=tombstone+%22active+directory%22&meta= will explain why you need to get a shift on with your network.
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cendrizziAuthor Commented:
Yeah, I knew about the tombstome timeout thing.  I figured I could get it by then but would need to do this other stuff now.  I really do need to get this ASAP.  What would i need to do to get rid of it on my main DC.  Remove it from sites and services.  Remove it's DNS records.  Anything else?
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JohnDemerjianCommented:
Cendrizzi

You would do this:
http://www.petri.co.il/delete_failed_dcs_from_ad.htm 
and for more backrgound you could read this:  http://support.microsoft.com/default.aspx?scid=kb;EN-US;216498
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cendrizziAuthor Commented:
You know, I got my VPN working in time and was able to do that.  Thanks very much for all your helpful feedback guys!
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