hi

we are planning to go with Exchange 2013 

and we will use 4 servers (2 mailbox role and 2 CAs role)

I don't know how can I calculate the cost or what is the concept that should be considered

can any one help me in simply way

Regards  

Mahmoud,

There is a dedicated website to assist you here: http://mla.microsoft.com/

Remember that, Exchange server license is coming as CALs (Standard/Enterprise). You may want to select how many CALs are required and the type

Hi Mahmoud,

Thank you for your question.

For licensing question, we must redirect them to customer service. 

http://support2.microsoft.com/gp/customer-service-phone-numbers/en-gb?wa=wsignin1.0

If there are any questions regarding this issue, please be free to let me know.

Best Regard,

Jim