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Yes, unless licensed by processor or core
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Yes, unless licensed by processor or core

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Already I purchased winodows 10 professional license for all 20 machines. Still i need CAL license for all 20 machines?
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Already I purchased winodows 10 professional license for all 20 machines. Still i need CAL license for all 20 machines?

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I have developed CRM (windows/web) application using .net. This application using SQL Server 2012 and windows server 2008/2012.<br />
This application installed &nbsp;(windows deployment) in more than 20 windows 8 computers. From this computer CRM applications accessing THE production (SQL Server DB and IIS) &nbsp;Windows Server 2012 server. &nbsp;Since the application using WEB Services i need IIS and it hosted in the same production server (SQL Server also hosted in the same server). Also i have a backoffice portal that is hosted in the same production server(local). So in the customer internal network anybody can access thebackoffice portal using web browser.<br />
How will the Windows CAL license work? Do i need CAL license for all 20 windows computer for accessing SQL server and IIS?
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I have developed CRM (windows/web) application using .net. This application using SQL Server 2012 and windows server 2008/2012.
This application installed  (windows deployment) in more than 20 windows 8 computers. From this computer CRM applications accessing THE production (SQL Server DB and IIS)  Windows Server 2012 server.  Since the application using WEB Services i need IIS and it hosted in the same production server (SQL Server also hosted in the same server). Also i have a backoffice portal that is hosted in the same production server(local). So in the customer internal network anybody can access thebackoffice portal using web browser.
How will the Windows CAL license work? Do i need CAL license for all 20 windows computer for accessing SQL server and IIS?

Do i need CAL license ?

The Windows operating systems have distinct methodologies for designing and implementing networks, and have specific systems to accomplish various networking processes, such as Exchange for email, Sharepoint for shared files and programs, and IIS for delivery of web pages. Microsoft also produces server technologies for networked database use, security and virtualization.

Windows Networking

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.

Microsoft SQL Server

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).

Windows Server 2003

Windows 8 is a personal computer operating system developed by Microsoft as part of the Windows NT family of operating systems, with an emphasis on improving its user experience on tablets. In particular, these changes included a touch-optimized Windows shell based on Microsoft's "Metro" design language, the Start screen, a new platform for developing apps with an emphasis on touchscreen input, integration with online services, support for USB 3.0, Advanced Format hard drives, near field communications, and cloud computing. Additional security features were introduced, such as built-in antivirus software, integration with Microsoft SmartScreen phishing filtering service and support for UEFI Secure Boot on supported devices with UEFI firmware.