There are distinct advantages to moving to OES 2 over staying on NetWare®. Gartner has issued report which you should find enlightening. Novell has also published a technical white paper on this subject.
Here are a few of the benefits of upgrading to OES 2.
NetWare Enters Extended Support in 2010: As Novell® has stated for a number of years now, NetWare enters its extended support phase in 2010.
Continued Hardware Support: When NetWare enters extended support, hardware vendors will cease to certify it on new server hardware.
Continued Third-party Solutions Support: As hardware vendors cease certification support, third-party software solutions providers, such as anti-virus and backup software vendors, will stop developing for the NetWare platform.
Dynamic Storage Technology: This breakthrough Novell technology drastically reduces storage costs and runs only on OES 2, not on NetWare. However, NSS volumes on NetWare can be assigned as secondary volumes in a pair.
iFolder 3.8: NetWare supports only Novell iFolder® 2.x, which lacks important features found in the latest version, such as automatic server provisioning, multiple iFolders per user, iFolder sharing between users, reassigning iFolder ownership, provisioning for LDAP groups, and numerous administrative enhancements.
Open Source Solutions: Open source initiatives such as Apache* and Tomcat* have been supported on NetWare only as Novell or others have ported them to the platform, but they are automatically available on OES.
Xen virtualization technology: This no-cost virtualization solution runs on OES 2 servers and lets you create NetWare virtual machines for those services that you want to keep on NetWare for the time being.
Domain Services for Windows: This OES 2 technology integrates eDirectory™ and Active Directory* users as well as Windows* and Novell file services.
File Systems: OES 2 not only supports the Novell Storage Services™ (NSS) file system, but also traditional Linux file systems, such as Ext3, XFS, and Reiser FS.
OES Services enhancements: As Novell OES services continue to evolve, the new features and technologies are almost always only available on OES 2.