http://techpubs.sgi.com/library/tpl/cgi ... /pr01.html
Retired Mode provides restricted support for older software products which are no longer generally distributed by SGI. This level of support has severe limitations on portability to new platforms. Availability of support at this level is limited to existing customers with whom we have existing contractual obligations. This is the final stage before a product is completely removed from the SGI product set. IRIX 6.2, IRIX 6.3, and IRIX 6.4 operating system versions are examples of major operating system releases that are supported in this category beginning January 2003. Software stays in this category for a minimum of 18 months before being moved to Expired Mode.
Expired Mode software products have reached the end of their useful life. These products are not supported or distributed in any form by SGI. Examples are: IRIX® 5.3, IRIXPro™, and Proconf.
Upcoming Changes to Support Mode Status
The following workstations, graphics and scalable server systems will transition to retired support mode after the IRIX 6.5.22 release in November 2003:
Sad but it had to happen some day. Hopefully SGI will take this opportunity to clean house when they remove all the older stuff from IRIX.