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APPLIES TO: 
2016 
2019 Subscription Edition
Tip
Looking for the Exchange Server 2016 system requirements? See Exchange Server 2016 system requirements.
Before you install Exchange Server SE or Exchange Server 2019, we recommend that you review this topic to ensure your network, hardware, software, clients, and other elements meet the requirements for these versions. Also, ensure that you understand the coexistence scenarios that are supported for Exchange Server SE, Exchange Server 2019 and earlier versions of Exchange.
The RTM release of Exchange Server SE will be code equivalent to Exchange Server 2019 CU15. The system requirements are therefore unchanged to Exchange Server 2019. More information about Exchange Server SE can be found in the Exchange Server Roadmap Update blog post.
Note
For Exchange Server 2019 installations in the Chinese Region, install the Exchange Server 2019 August 2023 (or later) Security Update to enable extended character support.
To install Exchange 2019, see Deploy new installations of Exchange.
Supported coexistence scenarios for Exchange 2019
The supported coexistence scenarios between Exchange 2019 and earlier supported versions of Exchange Server are described in the following table:
| Exchange version | Exchange 2019 organization coexistence |
|---|---|
| Exchange 2016 | Supported with Exchange 2016 CU11 or later on all Exchange 2016 servers in the organization, including Edge Transport servers. |
Supported hybrid deployment scenarios for Exchange 2019
Exchange 2019 supports hybrid deployments with Microsoft 365 organizations. For more information about specific hybrid deployments, see Hybrid Deployment Prerequisites.
Network and directory server requirements for Exchange 2019
The requirements for the network and the directory servers in your Exchange 2019 organization are described in the following table:
| Component | Requirement |
|---|---|
| Domain controllers | All ___domain controllers in the forest must be running one of the supported versions of Windows Server. A comprehensive list of supported ___domain controller operating systems can be found in the Exchange Server supportability matrix. |
| Active Directory forest | A comprehensive list of supported forest functional level can be found in the Exchange Server supportability matrix. |
| Active Directory site | The Active Directory site where you install the Exchange Server must contain at least one writeable ___domain controller that's also a global catalog server; or else, the installation will fail. Furthermore, you can't install the Exchange server and then remove the ___domain controller from the Active Directory site. |
| DNS namespace | Exchange 2019 supports the following DNS namespaces:
For more information about DNS namespaces that are supported by Exchange, see KB2269838. |
| IPv6 | Exchange 2019 supports IPv6 only when IPv4 is also installed and enabled on the Exchange server. If you deploy Exchange in this configuration, and your network supports IPv4 and IPv6, all Exchange servers can send data to and receive data from devices, servers, and clients that use IPv6 addresses. For more information, see IPv6 Support in Exchange 2013. |
Directory server architecture for Exchange 2019
Active Directory ___domain controllers on 64-bit hardware with a 64-bit version of Windows Server will increase directory service performance for Exchange 2019.
Installing Exchange 2019 on directory servers
For security and performance reasons, we don't recommend installing Exchange 2019 on Active Directory servers. Install Exchange 2019 only on member servers.
To learn more about the issues that you'll encounter when you install Exchange on a directory server, see Installing Exchange on a ___domain controller is not recommended [WarningInstallExchangeRolesOnDomainController]. After Exchange is installed, changing the server role from a member server to a directory server or vice-versa isn't supported.
Hardware requirements for Exchange 2019
For information about deploying Exchange in a virtualized environment, see Exchange Server virtualization.
| Component | Requirement | Notes |
|---|---|---|
| Processor | Either of the following types of 64-bit processors:
Notes:
|
For information on supported operating systems, see the Supported operating systems for Exchange 2019 section later in this topic. |
| Memory | Varies by Exchange server role:
|
Exchange 2019 has large memory support (up to 256 GB). |
| Paging file size | Set the paging file minimum and maximum value to the same size: 25% of installed memory. | None |
| Disk space |
|
None |
| Screen resolution | 1024 x 768 pixels (XGA) or higher | None |
| File system | NTFS: Required on partitions that contain the following types of files:
ReFS: Supported on partitions that contain the following types of Exchange files:
|
None |
Supported operating systems for Exchange 2019
A comprehensive list of supported operating systems can be found in the Exchange Server supportability matrix.
Supported PowerShell versions for Exchange 2019 servers
Exchange 2019 servers support the version of PowerShell that's included in the release of Windows Server where Exchange is installed. Don't install stand-alone downloads of Windows Management Framework (WMF) or PowerShell on Exchange servers.
Installing other software on Exchange 2019 servers
We don't support installing Office client or Office server software on Exchange servers (for example, SharePoint Server, Skype for Business Server, Office Online Server, or Project Server). Other software that you want to install on an Exchange 2019 server need to be designed to run on the same computer as Exchange Server.
Supported .NET Framework versions for Exchange 2019
We recommend that you use the latest version of the .NET Framework that's supported by the release of Exchange you're installing.
A comprehensive list of supported .NET Framework versions can be found in the Exchange Server supportability matrix.
Supported clients (with latest updates) in Exchange 2019
A comprehensive list of supported email clients can be found in the Exchange Server supportability matrix.
Lync/Skype For Business Server integration with Exchange 2019
If you're integrating Lync presence and instant messaging with Exchange Server, Lync Server 2013 Cumulative Update 10 or later is required. If you're integrating Skype for Business presence and instant messaging with Exchange Server, Skype for Business Server Cumulative Update 7 or later is required.
Exchange third-party clients
Exchange Server offers several well-known protocols, and publishes APIs that third-party vendors often write clients for.
Microsoft makes no warranties, expressed or implied, as to the overall suitability, fitness, compatibility, or security of clients that are created by third-party developers.
If you want to use a third-party client that uses our protocols or APIs, we recommend that you thoroughly review and test all considerations (functionality, security, maintenance, management, and so on) before you deploy the client in the enterprise workspace. We also recommend that you ensure that the third-party vendor offers an appropriate Enterprise Support Agreement (ESA).