FirstClass Technical Support Current Supported Versions Last update January 17, 2010 Windows Operating Systems FirstClass Server 11 Windows Server 2003 x64, Windows Server 2003 R2 x64, Windows Server 2008 x64, Windows Server 2008 Enterprise x64 Windows Server 2008 R2 x64* FirstClass Server 10 Windows Server 2003 x64, Windows Server 2003 R2 x64, Windows Server 2008 x64, Windows Server 2008 Enterprise x64 Windows Server 2008 R2 x64* FirstClass Server 9.1 2000 (SP4); 2003 FirstClass Server 9.0 2000 (SP4); 2003 FirstClass Internet Services 10 2003; 2008 FirstClass Internet Services 9.1 2000 (SP4); 2003 FirstClass Internet Services 9.0 2000 (SP4); 2003 FirstClass Client 10 2003; XP; Vista FirstClass Client 9.1.x 2000; 2003; XP;Vista FirstClass Client 9.0 2000; 2003; XP; NOTE:  If the Operating System is not explicitly mentioned, it is NOT supported *This operating system is only supported with FirstClass Server 10 SP1 Mac Operating Systems FirstClass Server 11 10.6.2 - 10.6.4 FirstClass Server 10 10.5.4-10.5.8 (64bit - Intel) Server or Desktop 10.6.2* FirstClass Server 9.1 10.4.9, 10.5.2 or 10.5.4 FirstClass Server 9.0 10.4.6 - 10.4.9 FirstClass Internet Services 10.0 10.5.4-10.5.8 (64bit - Intel) Server or Desktop FirstClass Internet Services 9.1 10.4.9, 10.5.2 or 10.5.4 FirstClass Internet Services 9.0 10.4.6 - 10.4.9 FirstClass Client 10 10.5.2 - 10.5.8; 10.6.1 FirstClass Client 9.1 10.4.6 - 10.4.9; 10.5.2 - 10.5.8 FirstClass Client 9.0 10.3.4 - 10.3.9; 10.4.6 -10.4.9 NOTE:  If the Operating System is not explicitly mentioned, it is NOT supported *This operating system is only supported with FirstClass Server 10, SP1 Linux Operating Systems FirstClass Server 11 Any 64 bit Linux distribution with a 2.6.23 based kernel FirstClass Server 10 Any 64 bit Linux distribution with a 2.6.23 based kernel FirstClass Server 9.1 Any Linux distribution with a 2.6 based kernel, or a 2.4 kernel with NTPL threads support FirstClass Server 9.0 Any Linux distribution with a 2.6 based kernel, or a 2.4 kernel with NTPL threads support FirstClass Internet Services 10 Any 64 bit Linux distribution with a 2.6.23 based kernel FirstClass Internet Services 9.1 Any Linux distribution with a 2.6 based kernel, or a 2.4 kernel with NTPL threads support FirstClass Internet Services 9.0 Any Linux distribution with a 2.6 based kernel, or a 2.4 kernel with NTPL threads support FirstClass Client 10 Any Mainstream Distribution With: Qt library version 3.3.3 or greater X11 library version 6.2 or greater libc version 6 FirstClass Client 9.1 Any Mainstream Distribution With: Qt library version 3.3.3 or greater X11 library version 6.2 or greater libc version 6 FirstClass Client 9.0 Any Mainstream Distribution With: Qt library version 3.3.3 or greater X11 library version 6.2 or greater libc version 6 NOTE:  If the Operating System is not explicitly mentioned, it is NOT supported Click here for additional product requirements