Server and Client operating system    Server OS :-    MSD AX 2009 supported Windows Server 2003, however MSD AX 2012 only supports 64-bit versions of Windows Server 2008 and the supported versions are  Windows Server 2008 R2 Standard Edition, Enterprise Edition, Web Edition, Data center Edition  Windows Server 2008 with Service Pack 2 Standard Edition, Enterprise Edition, Web Edition, Data center Edition   Client OS:- MSD AX 2009 client can be installed on Windows XP, however MSD AX 2012 requires either Windows 7 or Windows Vista OS (Both 32-bit and 64-bit versions of Windows 7  and Windows Vista are supported ). The supported versions are  Windows 7 Professional Edition, Ultimate Edition, or Enterprise Edition  Windows Vista Business Edition, Ultimate Edition, or Enterprise Edition, with Service Pack 2.     Enterprise Portal Server and Client    Server :- In Microsoft Dynamics AX 2012, Enterprise Portal can be installed only on 64-bit server operating systems...
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