Windows Server 2003 is a multipurpose operating system capable of handling a diverse set of server roles, depending on your needs, in either a centralized or distributed fashion. Some of these server roles include:
File and print server.
Web server and Web application services.
Mail server.
Terminal server.
Remote access and virtual private network (VPN) server.
Directory services, Domain Name System (DNS), Dynamic Host Configuration Protocol (DHCP) server, and Windows Internet Naming Service (WINS). Streaming media server.

Improvements to the Windows Server Operating System
Windows Server 2003 includes all the functionality customers need today from a Windows Server operating system to do more with less, such as security, reliability, availability, and scalability. In addition, Microsoft has improved and extended the Windows server operating systems to incorporate the benefits of Microsoft .NET for connecting information, people, systems, and devices.

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 5 contains more than 1200 components with development spanning over a two year period, so there are a huge number of new features covering a broad range of functionality. Red Hat Enterprise Linux 5 provides CIOs and IT managers with the means to reduce costs while improving operational flexibility throughout their computing infrastructure.

Virtualization on Red Hat Enterprise Linux 5
Virtualization is provided in all Server products and is optionally available for Client products
Storage and extended server virtualization are provided with Red Hat Enterprise Linux Advanced Platform
Red Hat Network supports virtualized guest operating systems
virt-manager, libvirt/virsh management tools
Security

SELinux enhancements include Multi-Level Security and targeted policies for all services
SEtroubleshooter GUI simplifies SELinux management
Integrated directory and security capabilities
IPSEC enhancements improve security and performance
ExecShield enhancements, such as a call frame Canary word, strengthen hacker defenses
New Audit features provide powerful new search/reporting and real-time monitoring

Networking & Interoperability
Network storage enhancements include Autofs, FS-Cache, and iSCSI support
IPv6 support and conformance enhancements
Improved Microsoft ® file/print and Active Directory integration

Red Hat Enterprise Linux 5 contains more than 1200 components with development spanning over a two year period, so there are a huge number of new features covering a broad range of functionality. Red Hat Enterprise Linux 5 provides CIOs and IT managers with the means to reduce costs while improving operational flexibility throughout their computing infrastructure.

Virtualization on Red Hat Enterprise Linux 5
Virtualization is provided in all Server products and is optionally available for Client products
Storage and extended server virtualization are provided with Red Hat Enterprise Linux Advanced Platform
Red Hat Network supports virtualized guest operating systems virt-manager, libvirt/virsh management tools Security SELinux enhancements include Multi-Level Security and targeted policies for all services SEtroubleshooter GUI simplifies SELinux management Integrated directory and security capabilities IPSEC enhancements improve security and performance ExecShield enhancements, such as a call frame Canary word, strengthen hacker defenses New Audit features provide powerful new search/reporting and real-time monitoring Networking & Interoperability Network storage enhancements include Autofs, FS-Cache, and iSCSI support IPv6 support and conformance enhancements Improved Microsoft ® file/print and Active Directory integration

SUSE Linux Enterprise from Novell
When you choose SUSE Linux Enterprise from Novell, you get the best engineered, most interoperable platform for enterprise computing. From the desktop to the data center, only SUSE Linux Enterprise delivers a complete open source platform for your mission-critical applications. Whether you are looking for a Linux solution that works with Microsoft Windows, or whether you are looking for a Linux solution with built-in virtualization, security and management tools, you'll get it all with SUSE Linux Enterprise. And it’s all backed by enterprise support from Novell and our large partner ecosystem. Come see why companies around the globe are choosing SUSE Linux Enterprise as their Linux solution, from the desktop to the data center.

Get up to eight times more real work with the same resources
Utilize more of your Linux servers' capacity by consolidating physical servers and applications through virtualization—lowering hardware, maintenance and electrical costs. With virtualization, SUSE Linux Enterprise servers can pull a lot more than their own weight.

Get reliable redundancy and dynamic failover
SUSE Linux Enterprise with High Availability Storage Infrastructure helps you prepare for the worst. Includes Heartbeat 2, which helps keep your network running no matter the workload.

More than 900 world-class support personnel
Don't trust your Linux servers to just anyone for support. Novell has more than 20 years of experience and more than 900 dedicated support personnel located in support centers covering every region of the world. Because Novell has long been involved in integrating its solutions with those of other vendors, our technical support personnel can tackle the toughest problems—at any scale and on any platform or combination of platforms.