How many Client Access Licenses do I need to purchase in this scenario

Here is the scenario:

Three servers, A, B and C, running Exchange, SQL and CRM respectively.

10 users.

We understand that we need the licenses for these applications at the server side eg Exchange and the client side eg Outlook and the OS license on the client and on the server

We understand that we need 10 Exchange User CALs, 10 SQL User CALs and 10 CRM User CALs.

I believe we also need 10 'regular' Windows User CALs?

Is this correct?
If so do we need 10 per server? I.e. 30? Or does 1 Windows CAL cover that client to connect to several Windows Servers?

failedAsked:
Who is Participating?
 
Lee W, MVPConnect With a Mentor Technology and Business Process AdvisorCommented:
You need 10 User CALs TOTAL (Device CALs MAY be an option if these people don't get mail on cell phones or connect remotely).  Each server comes with 5 User CALs so you only need 5 more and you don't need them per server (MS pretty much abandoned per server license, near as I can tell).

If you were runing SBS, the CALs DEFINITELY cover access to all servers.

DISCLAIMER: Licensing advice offered here is a "best effort" and based on the understanding of the respondents. Licenses can change and we may not be aware of these changes or may misunderstand them. Further, licenses can differ by country and/or region and what we understand to be true in our region could be false in your region. "they told me on Experts-Exchange" will not be a valid defense in a software audit.  All licensing questions should be confirmed with the appropriate licensing authority (the maker of the software/issuer of the license).  
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failedAuthor Commented:
Great, thank you leew, this is what we suspected,
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