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Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. The recommended way to upgrade a domain is to promote domain controllers that run newer versions of Windows Server and demote older domain controllers as needed. That method is preferable to upgrading the operating system of an existing domain controller. This list covers general steps to follow before you promote a domain controller that runs a newer version of Windows Server:.
Verify the target server meets system requirements. Verify Application compatibility. Verify security settings. Check connectivity to the target server from the computer where you plan to run the installation. You can delegate permissions to install AD DS. For more information, see Installation Management Tasks. Steps-by-step instructions to promote new and replica Windows Server domain controllers using Windows PowerShell cmdlets and Server Manager can be found in the following links:.
Prior to the release of Windows 8, Windows Update managed its own internal schedule to check for updates, and to download and install them. It required that the Windows Update Agent was always running in the background, consuming memory and other system resources. Windows 8 and Windows Server introduce a new feature called Automatic Maintenance. Automatic Maintenance consolidates many different features that each used to manage its own scheduling and execution logic.
This consolidation allows for all these components to use far less system resources, work consistently, respect the new Connected Standby state for new device types, and consume less battery on portable devices.
Because Windows Update is a part of Automatic Maintenance in Windows 8 and Windows Server , its own internal schedule for setting a day and time to install updates is no longer effective. To help ensure consistent and predictable restart behavior for all devices and computers in your enterprise, including those that run Windows 8 and Windows Server , see Microsoft KB article or see October cumulative rollup , then configure policy settings described in the WSUS blog post Enabling a more predictable Windows Update experience for Windows 8 and Windows Server KB The following table summarizes new features for AD DS in Windows Server R2, with a link to more detailed information where it is available.
For a more detailed explanation of some features, including their requirements, see What's New in Active Directory in Windows Server R2. The following table summarizes the new features for AD DS in Windows Server , with a link to more detailed information where it is available. To help ensure consistent and predictable restart behavior for all devices and computers in your enterprise, including those that run Windows 8 and Windows Server , you can configure the following Group Policy settings:.
The following table lists some examples of how to configure these settings to provide desired restart behavior. Error conditions can be corrected to eliminate concerns from a partially complete upgrade. The wizard also exports a Windows PowerShell script that contains all the options that were specified during the graphical installation. Taken together, the AD DS installation changes simplify the DC role installation process and reduce the likelihood of administrative errors, especially when you are deploying multiple domain controllers across global regions and domains.
For administrators that want to control the introduction of schema changes in an Active Directory forest independent of the installation of Windows Server DCs in an existing forest, Adprep.
Beginning with Windows Server , domain controllers also have the following secure default settings, compared to domain controllers that run Windows Server or Windows For more information about system requirements and pre-installation information, see Installing Windows Server There are no additional system requirements to install a new Active Directory forest, but you should add sufficient memory to cache the contents of Active Directory database in order to improve performance for domain controllers, LDAP client requests, and Active Directory-enabled applications.
If you are upgrading an existing domain controller or adding a new domain controller to an existing forest, review the next section to ensure the server meets disk space requirements.
This section covers disk space requirements only for upgrading domain controllers from Windows Server or Windows Server R2. For more information about disk space requirements for upgrading domain controllers to earlier versions of Windows Server, see Disk space requirements for upgrading to Windows Server or Disk space requirements for upgrading to Windows Server R2.
Size the disk that hosts the Active Directory database and log files in order to accommodate the custom and application-driven schema extensions, application and administrator-initiated indexes, plus space for the objects and attributes that you will be added to the directory over deployment life of the domain controller typically 5 to 8 years.
Right sizing at deployment time is typically a good investment compared to greater touch costs required to expand disk storage after deployment. On domain controllers that you plan to upgrade, make sure that the drive that hosts the Active Directory database NTDS.
DIT file before you begin the operating system upgrade. If there is insufficient free disk space on the volume, the upgrade can fail and the upgrade compatibility report returns an error indicating insufficient free disk space:. In this case, you can try an offline defragmentation of the Active Directory database to recapture additional space, and then retry the upgrade. In previous releases, Windows Server editions differed in their support of server roles, processor counts and large memory support.
The Standard and Datacenter editions of Windows Server support all features and underlying hardware but vary in their virtualization rights - two virtual instances are allowed for Standard edition and unlimited virtual instances are allowed for Datacenter edition. The following Windows client and Windows Server operating systems are supported for domain member computers with domain controllers that run Windows Server or later:. You cannot upgrade domain controllers that run Windows Server or bit versions of Windows Server To replace them, install domain controllers that run a later version of Windows Server in the domain, and then remove the domain controllers that Windows Server Note that you cannot convert a domain controller that runs an evaluation version of Windows Server directly to a retail version.
Instead, install an additional domain controller on a server that runs a retail version and remove AD DS from the domain controller that runs on the evaluation version. Due to a known issue, you cannot upgrade a domain controller that runs a Server Core installation of Windows Server R2 to a Server Core installation of Windows Server The upgrade will hang on a solid black screen late in the upgrade process.
Rebooting such DCs exposes an option in boot. An additional reboot triggers the automatic rollback to the previous operating system version. Until a solution is available, it is recommended that you install a new domain controller running a Server Core installation of Windows Server instead of in-place upgrading an existing domain controller that runs a Server Core installation of Windows Server R2. For more information, see KB article Windows Server requires a Windows Server forest functional level.
That is, before you can add a domain controller that runs Windows Server to an existing Active Directory forest, the forest functional level must be Windows Server or higher. This means that domain controllers that run Windows Server R2, Windows Server , or Windows Server can operate in the same forest, but domain controllers that run Windows Server are not supported and will block installation of a domain controller that runs Windows Server If the forest contains domain controllers running Windows Server or later but the forest functional level is still Windows , the installation is also blocked.
Windows domain controllers must be removed prior to adding Windows Server domain controllers to your forest. In this case, consider the following workflow:. The new Windows Server domain functional level enables one new feature: the KDC support for claims, compound authentication, and Kerberos armoring KDC administrative template policy has two settings Always provide claims and Fail unarmored authentication requests that require Windows Server domain functional level.
The Windows Server forest functional level does not provide any new features, but it ensures that any new domain created in the forest will automatically operate at the Windows Server domain functional level. The Windows Server domain functional level does not provide other new features beyond KDC support for claims, compound authentication, and Kerberos armoring. But it ensures that any domain controller in the domain runs Windows Server After you set the forest functional level to a certain value, you cannot roll back or lower the forest functional level, with the following exceptions: after you raise the forest functional level to Windows Server , you can lower it to Windows Server R2.
If the forest functional level is set to Windows Server R2 , it cannot be rolled back, for example, to Windows Server After you set the domain functional level to a certain value, you cannot roll back or lower the domain functional level, with the following exceptions: when you raise the domain functional level to Windows Server R2 or Windows Server , and if the forest functional level is Windows Server or lower, you have the option of rolling the domain functional level back to Windows Server or Windows Server R2.
If the domain functional level is set to Windows Server R2 , it cannot be rolled back, for example, to Windows Server Beyond functional levels, a domain controller that runs Windows Server provides additional features that are not available on a domain controller that runs an earlier version of Windows Server.
For example, a domain controller that runs Windows Server can be used for virtual domain controller cloning, whereas a domain controller that runs an earlier version of Windows Server cannot. But virtual domain controller cloning and virtual domain controller safeguards in Windows Server do not have any functional level requirements.
Microsoft Exchange Server requires a forest functional level of Windows server or higher. AD DS cannot be installed on a server that also runs the following server roles or role services:. Though they are not operations master roles, another change in AD DS installation is that DNS server role and the global catalog are installed by default on all domain controllers that run Windows Server Improvements in AD DS beginning in Windows Server enable safer virtualization of domain controllers and the ability to clone domain controllers.
Cloning domain controllers in turn enables rapid deployment of additional domain controllers in a new domain and other benefits. The following table covers common Active Directory-integrated Microsoft applications.
The table covers what versions of Windows Server that the applications can be installed on and whether the introduction of Windows Server DCs affects application compatibility. Configuration Manager Configuration Manager Service Pack 1: Microsoft will add the following operating systems to our client support matrix with the release of Service Pack 1: - Windows 8 Pro - Windows 8 Enterprise - Windows Server Standard - Windows Server Datacenter All site server roles - including site servers, SMS providers, and management points - can be deployed to servers with the following operating system editions: - Windows Server Standard - Windows Server Datacenter Microsoft Endpoint Configuration Manager current branch Supported operating systems for Configuration Manager site system servers.
It cannot be run on a Server Core installation. It can be run on virtual servers. Lync Server Lync Server can be installed on a new not upgraded installation Windows Server if October cumulative updates for Lync Server are installed. Upgrading the operating system to Windows Server for an existing installation of Lync Server is not supported. Windows Server Update Services 3. Exchange Windows Server Standard and Datacenter are supported for the following roles: schema master, global catalog server, domain controller, mailbox and client access server role Forest Functional Level: Windows Server or higher Source: Exchange System Requirements Exchange Source: Exchange Service Pack 3 Exchange with Service Pack 3 can be installed on Windows Server member servers.
Exchange System Requirements lists the latest supported schema master, global catalog and domain controller as Windows Server R2. Skip to main content.
This browser is no longer supported. Download Microsoft Edge More info. Table of contents Exit focus mode. Table of contents. Note Microsoft Exchange Server requires a forest functional level of Windows server or higher. Note Though they are not operations master roles, another change in AD DS installation is that DNS server role and the global catalog are installed by default on all domain controllers that run Windows Server Submit and view feedback for This product This page.
View all page feedback. In this article. Workplace Join. Allows information workers to join their personal devices with their company to access company resources and services.
Web Application Proxy. Active Directory Federation Services. AD FS has simplified deployment and improvements to enable users to access resources from personal devices and help IT departments manage access control.
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