sbs2003 to exchange 2010 migration

i read Your article about sbs2003 to Exchange 2010 migration. in this article you describe a migration to one server that will be dc and Exchange server. if i want to  setup a second
2008r2 with dc role there is somethig particular to do? is so terrible the coesistence of Exchange with the dc role?
thank You for your help.
ITSoluzioniAsked:
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Lionel MMConnect With a Mentor Small Business IT ConsultantCommented:
1. if i want to  setup a second 2008r2 with dc role there is somethig particular to do?
http://technet.microsoft.com/en-us/library/cc786438%28v=WS.10%29.aspx
You can have more than one DC, which is recommended in case one goes down. You can use different servers running different domain services but there are some that you should be running on both so they can keep your domain going in the event one goes down. (see comments towards the end)
2. is so terrible the coesistence of Exchange with the dc role?
It is recommended but not required to  Exchange on a separate server. If you have Server 2008 you can setup a virtual servers so you don't have the added expenses of separate physical servers. It will be well worth you time to do so to minimize the potential of problems of running Exchange on a DC server.

For some in-depth understanding of how multiple domain controllers work together read this http://support.microsoft.com/kb/223346 and then see this where someone asked a question similar to yours (User Forum)
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