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On administrative computer (WebOffice author) as well as on UserManagement Admin Web Server, Windows .NET Framework 2.0 is required.
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=0856eacb-4362-4b0d-8edd-aab15c5e04f5
Note: .NET Framework 2.0 should by default be already available on your up-to-date Windows Server system.