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First: <br />

<blockquote>
I know in previous versions of SBS you have not been able to add additional DC's.
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This is incorrect.<br />
<br />
SBS can have MANY other DCs. &nbsp;The restriction is you cannot have additional SBS servers on the domain. This is because SBS requires it hold the FSMO master roles in the domain - you can't have TWO DCs holding all the FSMO masters making it impossible to have multiple SBS servers.<br />
<br />
As for your migration plan, it should be fine - it would be wise to setup a test network and practice this a couple of times - assuming you don't want to accidentally destroy your network and make your users useless for a few days while you recover... OR hire a pro with experience to do it for you. &nbsp;Your call.<br />
<br />
Keep in mind you'll want to remove Exchange (uninstall), and once you transfer the FSMO roles you have 3 weeks before it starts shutting down because you're in violation of licensing - so you have 3 weeks to complete the process.
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Excellent thanks for the reply<br />
<br />
I want to migrate the users to office 365 which I plan on doing first. Exchange won't be an issue by the time I'm ready to decom the SBS server. <br />
<br />
But just to be clear I can Add a DC (for redundancy) to the domain without moving the FSMO roles across and demoting the SBS server?
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Hi guys<br />
<br />
I want to decommission our current SBS2011 server by adding a new DC to the domain and moving the FSMO roles across to the new DC, then demoting the current SBS server. <br />
<br />
Is this possible? I have heard it is but I know in previous versions of SBS you have not been able to add additional DC's.<br />
<br />
Any advice is much appreciated! <br />
<br />
Many thanks
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Hi guys

I want to decommission our current SBS2011 server by adding a new DC to the domain and moving the FSMO roles across to the new DC, then demoting the current SBS server. 

Is this possible? I have heard it is but I know in previous versions of SBS you have not been able to add additional DC's.

Any advice is much appreciated! 

Many thanks

SBS 2011 - Decom

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.