Windows Server CALs vs. Per-Core Licensing: Which Is Right for You?

October 4, 2023

When it comes to licensing Windows Server, organizations often face a choice between Client Access Licenses (CALs) and Per-Core Licensing. Each licensing model has its own set of advantages and considerations. In this guide, we’ll help you navigate the decision-making process by exploring the differences between Windows Server CALs and Per-Core Licensing, ultimately helping you determine which one is the right fit for your organization.

Understanding Windows Server CALs

Client Access Licenses (CALs) are a licensing model where each user or device that accesses the Windows Server requires a CAL. CALs come in two varieties: User CALs and Device CALs.

User CALs: These licenses are assigned to individual users, allowing them to access the server from any device.
Device CALs: These licenses are assigned to specific devices, permitting any user of that device to access the server.

Per-Core Licensing

Per-Core Licensing is a model where organizations pay for Windows Server based on the number of physical cores in the server. This licensing model is designed to accommodate the increasing trend of highly virtualized environments.

Windows Server Standard: Requires the purchase of Core licenses for each physical core in the server.
Windows Server Datacenter: Also requires Core licenses for each physical core but allows for unlimited virtualization rights.

Factors to Consider

1. Number of Users and Devices

CALs: Suitable for organizations with a known and relatively stable number of users or devices. You can add CALs as needed.
Per-Core Licensing: Ideal for organizations with varying numbers of users or devices, especially in highly dynamic environments.

2. Virtualization Needs

CALs: May require additional licenses for virtualized servers.
Per-Core Licensing: Windows Server Datacenter edition offers unlimited virtualization rights, making it cost-effective for highly virtualized environments.

3. Budget and Predictability

CALs: Provide predictability in licensing costs since you pay per user or device.
Per-Core Licensing: Costs depend on the number of physical cores, which can vary across servers.

4. Flexibility and Growth

CALs: Easy to manage and add CALs as your organization grows.
Per-Core Licensing: Offers flexibility for organizations with fluctuating hardware and virtualization needs.

Making the Right Choice

The decision between CALs and Per-Core Licensing depends on your organization’s unique requirements and priorities:

Choose CALs if you have a relatively stable number of users or devices and want cost predictability.
Choose Per-Core Licensing if you have dynamic hardware and virtualization needs or are looking for unlimited virtualization rights with the Datacenter edition.

Best Practices

Assessment: Regularly assess your organization’s licensing needs to ensure they align with your growth and changes.
Stay Informed: Keep abreast of Microsoft’s licensing policies, which can evolve over time.
Consult with Experts: For complex licensing scenarios, consult with Microsoft licensing experts or partners to make informed decisions.

Conclusion

In conclusion, selecting the right Windows Server licensing model is a critical decision for your organization’s IT infrastructure. By understanding the differences between CALs and Per-Core Licensing and considering your organization’s specific needs and budget, you can make an informed choice that aligns with your long-term goals.

Stay tuned to our blog for more Windows Server insights and tips.