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perfect, thank you both.<br />
<br />
what happens with already existing attributes in the AD when i run the schema extension? Am i right that will be leaved as it is and skipped?
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perfect, thank you both.

what happens with already existing attributes in the AD when i run the schema extension? Am i right that will be leaved as it is and skipped?

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At a costumer i have to implement SCCM 2012 R2. AD Forest functional level is 2008 R2<br />
From an earlier installation of SMS 2003R2 the system management container already exists.<br />
<br />
Can i leave the container as it is or may i run into problems?<br />
<br />
Also a schema extension was done for the SMS installation. What happens when i now run a schema extension for 2012R2?
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At a costumer i have to implement SCCM 2012 R2. AD Forest functional level is 2008 R2
From an earlier installation of SMS 2003R2 the system management container already exists.

Can i leave the container as it is or may i run into problems?

Also a schema extension was done for the SMS installation. What happens when i now run a schema extension for 2012R2?

Installation of SCCM2012R2 - System Management Container already exists  in AD from earlier SMS installation

Systems Center Configuration Manager (SCCM, formerly known as Systems Management Server) is Microsoft’s system software for managing large groups of not only Microsoft computers, but those running other operating systems, such as Linux, OS-X, and various mobile technologies.

SCCM

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.