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I suggest you to call Microsoft directly. MS sales person can provide you best options for CAL's.
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I suggest you to call Microsoft directly. MS sales person can provide you best options for CAL's.

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HI <br />
<br />
if we have 200 users &nbsp;and every user has &nbsp;pc - laptop - Mobil device and all of them will access Citrix and email <br />
<br />
we have around 20 VMS XENAPP servers to serve these users<br />
<br />
we have 3 VMS exchange servers <br />
<br />
what the best and cheapest option to buy CALS license for this <br />
<br />
do we need <br />
User CAL : Ideal for companies with employees who need to have roaming access to the corporate network using multiple devices, as well as from unknown devices<br />
<br />
and what about exchange CALS what the best cheap option per CAL per user or per server <br />
<br />
kindly advice <br />
Sword
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HI 

if we have 200 users  and every user has  pc - laptop - Mobil device and all of them will access Citrix and email 

we have around 20 VMS XENAPP servers to serve these users

we have 3 VMS exchange servers 

what the best and cheapest option to buy CALS license for this 

do we need 
User CAL : Ideal for companies with employees who need to have roaming access to the corporate network using multiple devices, as well as from unknown devices

and what about exchange CALS what the best cheap option per CAL per user or per server 

kindly advice 
Sword

CALS license quastion

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

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.

Windows Server 2008

Citrix is the synonym for the virtualization and application infrastructure systems developed by the company of the same name. Main areas are application virtualization, Software-As-A-Service (SaaS), cloud-computing and networking. The two most well-known are Citrix XenApp or Citrix CloudPlatform.