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You can buy CALS by computer or user. &nbsp;If you have more users than computers, it makes sense to buy it per user. &nbsp;Also, you will have to buy 2008 cals and have them down graded for 2003, as I don't think that OS is supported anymore.
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You can buy CALS by computer or user.  If you have more users than computers, it makes sense to buy it per user.  Also, you will have to buy 2008 cals and have them down graded for 2003, as I don't think that OS is supported anymore.

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I know that, but when i buy 3 win server license &nbsp;and get 15 CAL with them, that cal are user or device cal ?<br />
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If i want that all users access one server in the same time, 15 CAL's from win server license is enough or? 
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I know that, but when i buy 3 win server license  and get 15 CAL with them, that cal are user or device cal ?

If i want that all users access one server in the same time, 15 CAL's from win server license is enough or?

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If you have 15 users, yes, they can all access the server.<br />
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It should say with your purchase if its user or device, typically it's user cals. &nbsp;Also, I only use Cals on servers that have AD on it, not on any storage or file servers.
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If you have 15 users, yes, they can all access the server.

It should say with your purchase if its user or device, typically it's user cals.  Also, I only use Cals on servers that have AD on it, not on any storage or file servers.

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CAL are per user accesing SIMULTANEOUSLY. If only 5 users are accessing to server, you only need this 5 CALs.
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CAL are per user accesing SIMULTANEOUSLY. If only 5 users are accessing to server, you only need this 5 CALs.

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If I buy 3 x Windows Server 2008 or 2003 license with 5 CAL ( I have 3 Servers ), and in the office are 12 computers, <br />
do I have license for that computers or I must buy more CAL's ???
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If I buy 3 x Windows Server 2008 or 2003 license with 5 CAL ( I have 3 Servers ), and in the office are 12 computers, 
do I have license for that computers or I must buy more CAL's ???

Windows CAL

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 Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.