Parallels Plesk Panel 9.5.4 for Windows requires one of the following operating systems installed on the server:
Windows Server 2003 SP1/SP2/R2 Web Edition
Windows Server 2003 SP1/SP2/R2 Standard Edition
Windows Server 2003 SP1/SP2/R2 Enterprise Edition
Windows Server 2003 SP1/SP2/R2 Datacenter Edition
Windows Server 2008 Web Edition
Windows Server 2008 Standard Edition
Windows Server 2008 Enterprise Edition
Windows Server 2008 Datacenter Edition
Windows Server 2008 SP1/SP2/R2 Web Edition
Windows Server 2008 SP1/SP2/R2 Standard Edition
Windows Server 2008 SP1/SP2/R2 Enterprise Edition
Windows Server 2008 SP1/SP2/R2 Datacenter Edition