Removing SBS from Domain

My client has windows domain setup which has two domain controllers, one is SBS and other is windows 2008r2. We also have exchange 2010 server running on windows 2008r2. We want to get rid of SBS server. But when we shut this server, user stop getting mails. All role right now are moved  to windows 2008r2 server and DNS of client is pointing to windows 2008r2 server. Still we have same issue when turn off the SBS server. We want fix this issue before we remove the SBS from network. Please guide me how to fix this issue.
Avinash MohodAsked:
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Cris HannaCommented:
What you haven't told us is which version of SBS but here are some thoughts
- you can't just turn it off...There are specific things to be done in order to effectively let the new server take over

- Exchange must be properly removed for clients to understand where they should point.
- DHCP must be moved over to the new server
- the new server must be a global catalog server
- then you transfer the FSMO roles to the new server
- then DC Promo the SBS box out of the domain

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Avinash MohodAuthor Commented:
Amit.....thanks for info....the windows is already part of SBS domain....can still follow the steps mentioned in link

Cris.......thanks for providing is running on widnows 2008r2 server and all client are pointing to that server. But still when SBS goes down the outlook client stop working.
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Cris HannaCommented:
But is Exchange still installed on the SBS box? Are it's services still running?
Avinash MohodAuthor Commented:
Cris......Interesting question....I checked SBS server and found few exchange services are running on it. these services are

Microsoft Exchange IMAP4
Microsoft Exchange POP3
Microsoft Exchange Routing Engine

Do you think because of these services we are having issue with exchange when SBS server goes down.

Cris HannaCommented:
Uninstalling Exchange makes changes in a  number of areas including AD.  Uninstall it then DCpromo the SBS box out of the domain
Dirk MareSystems Engineer (Acting IT Manager)Commented:
Make sure the new DC is global Catalog and that exchange server DNS settings are pointing to the new DC..

Avinash MohodAuthor Commented:
thanks for your input
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