Me lo sono letto tutto... e ho voluto evidenziarne 
alcune parti:
  
  Organizations that build software using Team System typically look 
  for users to “acceptance test” applications before they are deployed to ensure 
  the application meets both the specifications and needs of users. An exception 
  is provided for this scenario; non-licensed users may access the operating 
  system and server software solely for the purpose of user acceptance 
  testing.
  
  Team 
  Foundation Server is accessed through Team Explorer. You may install Team 
  Explorer on as many physical devices as you like; however, it can only be used 
  with Team Foundation Server. 
  Additional 
  aspects of Team Foundation Server licensing:
  ·         
  You may buy an external 
  connector license to allow any number of external users to access and use one 
  of your licensed copies of the server software. “External users” refers to 
  users that are neither (i) your or your affiliates’ employees, nor (ii) your 
  or your affiliates’ on site contractors or agents.
  
  A 
    
       CAL  
        is 
  required for users or devices which:
  ·         
  Directly access Team Foundation 
  Server or SQL Server 2005.
  ·         
  Indirectly query or write to 
  Visual Studio 2005 Team Foundation Server or SQL Server 2005 through another 
  software application or device.
  A 
     
     CAL   
      is not 
  required for users who:
  ·         
  View static Team Foundation 
  Server data that has been manually distributed outside of the server 
  software.
  ·         
  Receive Team Foundation Server 
  reports through e-mail and do not indirectly access the server to refresh, 
  create, or update data.
  ·         
  Receive printed Team Foundation 
  Server reports.
  
  Team 
  Foundation Server is also available in a workgroup edition, which is limited 
  to five users. Team Foundation Server Workgroup Edition has identical 
  functionality to Team Foundation Server with the exception of the limitation 
  on the number of users. Team Foundation Server Workgroup Edition is provided 
  with Team System client products that are licensed with MSDN Premium 
  Subscriptions. In addition, Team Foundation Server CALs are not required for 
  accessing Team Foundation Server Workgroup Edition.
  
  Microsoft® Visual Studio® 2005 Team Test Load 
  Agent, which includes both agent and controller software, is for creating 
  additional, synchronized load. Team Test Load Agent enables users to scale-out 
  test load by adding more physical devices, each with the agent software 
  installed, and synchronized by the controller software. Team Test Load Agent 
  is licensed per processor; users must acquire a license for each processor on 
  which Team Test Load Agent runs, regardless of the number of cores those 
  processors have. In addition, Team Test Load Agent requires Team Edition for 
  Software Testers to generate synchronized load and report test 
  results.
  Using the 
  recommended hardware configuration for Team Test Load Agent, example load 
  generation scenarios are shown in Table 5 (note that load is typically 
  measured in concurrent virtual users).
   
  
  
    
    
      | Test Load 
        Required | Team Edition for 
        Testers | Team Test Load 
        Agent | 
    
    
      | 1,000 Virtual Users 
        (VU) | 1 | - | 
    
      | 5,000 
        VU | 1 | 5 | 
    
      | 10,000 
        VU | 1 | 10 | 
    
      | 25,000 
        VU | 1 | 25 |