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Lenovo Windows Server 2025 Datacenter ROK 16-Core is designed for larger Lenovo server deployments where customers require advanced virtualisation rights and enterprise-grade server features.

This licence is commonly used for Hyper-V hosts, private cloud environments, virtualised server estates and high-density workloads running on eligible Lenovo hardware.

Datacenter is typically chosen where the customer plans to run multiple virtual machines on the same physical server. The Lenovo Datacenter ROK SKU is listed as a 16-core MultiLang product under part number 7S1S000JWW.

Key features:

Genuine Lenovo ROK / OEM Microsoft licence Windows Server 2025 Datacenter edition 16-core base server licence Designed for eligible Lenovo server hardware Suitable for high-virtualisation environments

Ideal for Hyper-V and private cloud workloads

Best for:

Lenovo server customers running multiple virtual machines or larger virtualised environments.

The Lenovo Windows Server 2025 Standard 2-Core Add-On is used when a Lenovo server has more than the base 16 physical cores covered by the main Windows Server 2025 Standard licence.

Windows Server licensing is based on the number of physical cores in the server. A minimum of 16 cores must be licensed, and any cores above that need to be covered with additional core licences.

This add-on is commonly supplied with Lenovo server builds using higher-core processors, especially modern Lenovo ThinkSystem servers.

Key features:

Lenovo Windows Server 2025 Standard 2-core add-on Used with a base 16-core Windows Server licence Helps correctly licence higher-core Lenovo servers Common add-on for modern server builds Suitable for eligible Lenovo server hardware

Best for:

Lenovo servers with more than 16 physical cores.

Lenovo Windows Server 2025 Standard ROK 16-Core is a genuine Lenovo OEM Microsoft server licence designed for Lenovo server deployments.

This Reseller Option Kit licence is suitable for businesses installing Windows Server 2025 Standard on eligible Lenovo server hardware, including Lenovo ThinkSystem rack and tower servers.

Windows Server 2025 Standard is commonly used for general business server workloads such as file sharing, Active Directory, print services, business applications, remote access and lightweight virtualisation.

The 16-core licence is the normal starting point for Windows Server licensing. Microsoft server licensing requires a minimum of 16 cores per server, with additional core packs required where the physical server has more than 16 cores. Lenovo’s Microsoft Software Solution guide confirms that Lenovo OEM Windows Server Standard and Datacenter base licences cover up to 16 cores, with additional core licences available for servers above that level.

Key features:

Genuine Lenovo ROK / OEM Microsoft licence Windows Server 2025 Standard edition 16-core base server licence Designed for eligible Lenovo server hardware Suitable for Lenovo ThinkSystem server builds

Ideal for small and medium business server deployments Common choice for file servers, domain controllers and application servers

Best for:

Businesses deploying Windows Server 2025 Standard on Lenovo server hardware.

Licence note: Client Access Licences may also be required for users or devices accessing the Windows Server environment.

Windows Server 2022 Datacenter ROK is the highest-tier Microsoft server OS for Lenovo ThinkSystem deployments. A single 16-core licence permits an unlimited number of Windows Server virtual machines on the licensed host, making it the most cost-effective option for dense Hyper-V hosts. The ROK activation is tied to the Lenovo server it ships with. Windows Server CALs are still required per connecting user or device. Downgrade rights to WS 2019 and 2016 Datacenter apply. Suitable for IT brokers quoting virtualised environments, VDI hosts, or private cloud builds on Lenovo ThinkSystem SR650 V3, SR630 V4, or SR655 V3.

The Lenovo Windows Server 2025 10 User CAL is designed for businesses that need ten users licensed to access a Windows Server 2025 environment.

It is commonly supplied with Lenovo Windows Server ROK licences where users need access to server-based services including file storage, Active Directory, print services, business applications and other Windows Server resources.

This is one of the best attach products to list alongside Lenovo Windows Server 2025 Standard and Datacenter licences.

Key features:

10 User CAL pack For Windows Server 2025 environments Suitable for small and medium businesses Common attach item for Lenovo ROK server licences Helps customers correctly licence user access

Best for:

SME server deployments with ten users accessing Windows Server services.

The Lenovo Windows Server 2025 5 User CAL provides Client Access Licensing for five users accessing a Windows Server 2025 environment.

User CALs are commonly required where staff access Windows Server services such as file shares, Active Directory, print services, business applications or remote server resources.

This is a strong run-rate product because most Windows Server deployments require CALs alongside the main server licence. Ballicom lists Lenovo 7S1S003PWW as a Windows Server 2025 Client Access Licence.

Key features:

5 User CAL pack For Windows Server 2025 environments Suitable for business users accessing server services Commonly sold with Windows Server Standard or Datacenter

Ideal for small office server deployments

Best for:

Small businesses and teams needing five users licensed for Windows Server access.