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We have a Windows Server 2003 forest that currently contains 8 domain controllers running Windows 2003 server, standard edition, sp2. &nbsp;Two of these controllers are our ADC and BDC that also function as our DNS and WINS servers. &nbsp;We also have several member servers which are a combination of Windows Server 2003, standard edition, sp2; WIndows Server 2003 R2, standard edition, sp2; Windows 2000 server, sp4.<br />
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Our Forest and domain controllers all currently run in &quot;mixed&quot; mode. &nbsp;We'd like to change the functionality level to &quot;native&quot; mode for all domain controllers and the forest. &nbsp;There are NO NT Servers in this Forest.<br />
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What, if any, problems can we expect when making this change? &nbsp;Any residual problems afterward?
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We have a Windows Server 2003 forest that currently contains 8 domain controllers running Windows 2003 server, standard edition, sp2.  Two of these controllers are our ADC and BDC that also function as our DNS and WINS servers.  We also have several member servers which are a combination of Windows Server 2003, standard edition, sp2; WIndows Server 2003 R2, standard edition, sp2; Windows 2000 server, sp4.

Our Forest and domain controllers all currently run in "mixed" mode.  We'd like to change the functionality level to "native" mode for all domain controllers and the forest.  There are NO NT Servers in this Forest.

What, if any, problems can we expect when making this change?  Any residual problems afterward?

What are the cons when change functionality level from mixed to native mode?

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.

Active Directory

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).