From below listed system requirements of Internet Explorer 9, IE9 is not supported on Windows Server 2003.
Internet Explorer 9 system requirements
Computer/Processor
- Computer with a 1 gigahertz (GHz) 32-bit (x86) or 64-bit (x64) processor.
Operating System
- Windows Vista 32-bit with Service Pack 2 (SP2) or higher
- Windows Vista 64-bit with Service Pack 2 (SP2) or higher
- Windows 7 32-bit or higher
- Windows 7 64-bit or higher
- Windows Server 2008 32-bit with Service Pack 2 (SP2) or higher
- Windows Server 2008 64-bit with Service Pack 2 (SP2) or higher
- Windows Server 2008 R2 64-bit
Memory
- Windows Vista 32-bit – 512 megabytes (MB)
- Windows Vista 64-bit – 512 MB
- Windows 7 32-bit – 512 MB
- Windows 7 64-bit – 512 MB
- Windows Server 2008 32-bit – 512 MB
- Windows Server 2008 64-bit – 512 MB
- Windows Server 2008 R2 64-bit – 512 MB
Hard Drive Space
- Windows Vista 32-bit – 70 MB
- Windows Vista 64-bit – 120 MB
- Windows 7 32-bit – 70 MB
- Windows 7 64-bit – 120 MB
- Windows Server 2008 32-bit – 150 MB
- Windows Server 2008 64-bit – 200 MB
- Windows Server 2008 R2 64-bit – 200 MB
Drive
- CD-ROM drive (if installation is done from a CD-ROM)
Display
- Super VGA (800 x 600) or higher-resolution monitor with 256 colors
Peripherals
- Modem or Internet connection
- Microsoft Mouse, Microsoft IntelliMouse, or compatible pointing device
Reference: Internet Explorer 9 system requirements – Microsoft Windows
