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  Hi Celtic,
  
  Minimum requirement to implement OCS 2007 are 
  
  • Domain controllers run Microsoft Windows® 2000 Server SP4 (Service Pack 4), Microsoft Windows Server® 2003 SP1, or Windows Server 2003 R2 or later operating systems. (Windows Server 2003 R2 is recommended).
  • Global catalog servers run Windows 2000 Server SP4, Windows Server 2003 SP1, or Windows Server 2003 R2 or later. (Windows Server 2003 R2 is recommended).
  • All domains in which you deploy Office Communications Server use Windows 2000 Server native mode or later operating system. You cannot deploy Office Communications Server in a mixed mode domain.
  
  There is no harm if your domain dunctional level is windows 2000 native

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  HCL OCS Team

  Monday, February 23, 2009 6:34 PM
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   Hi Satpal,
  Those settings are for OCS 2007 I was looking for OCS 2007 R2. I have done some research and it looks like Windows 2003 AD must be 2003 native.
  Thanks for reply
  P

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  Celtic

  • Marked as answer by TechnoMusic Tuesday, February 24, 2009 3:33 PM

  Tuesday, February 24, 2009 9:49 AM
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  Hi,
  This is a prerequisite the AD must be in 2003 Native Mode.
  
  Ricardo
  

  Wednesday, February 25, 2009 5:29 PM