Reinstalling Server 2003 and its effect on Exchange Server

The server 2003 installation (which was set up long before I arrived) has severe problems with profiles, DNS settings and other things.  I won't bore you with the details, but suffice to say that starting from scratch with it seems the best option (it's a small network - about 30 users).

My one niggling doubt is with how this will affect Exchange. My plan is to change the groups/users which were created in a fairly random ad hoc way.  Will it cause problems trying to associate the new users with already existing exchange mailboxes (i.e. to avoid having to start from scratch with the Exchange server)?
markrichardson84Asked:
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reubstrCommented:
I have moved mailboxes and I haven't lost any.

A couple of questions to ask though.

1. Is this the only server?
2. Is it a DC and EXCH? Or are they 2 separate boxes?
3. Do you have more than one DC?

I could advise you on this, but without this information, it is hard to give the best advise.
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markrichardson84Author Commented:
Thanks for the quick response and apologies for the lack of information I included - was convinced I'd written a couple of sentences explaining the network setup.

In answer to your question, the current setup has two hardware severs, each of which is a DC - one server runs Sever 2003 and the other is the Exchange server.

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reubstrCommented:
Ok. Make sure your FSMO roles are moved, and a GC is still in place.
http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/2003_Server/Q_23131213.html 

Once this is done, as long as the exchange box is a DC, you will not hurt it. Only make sure your firewall is pointing to the DNS/LDAP server that is up and running.

As far as moving mailboxes, in AD, remove exchange attributes. Then, in Exchange System Man, go to the mailbox, and reconnect it. You may have to update the mailboxes by right clicking and "Run Cleanup Agent."

After this, go to recipients, recipient updates, right click each policy and "Update now". Takes a couple seconds.
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Windows Server 2003

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