The old Cisco battleships, the pre-ISR routers, are going to be discontinued in the next upcoming IOS versions, starting from 12.4(20)T.
I found this information while I was going through a presentation about new features that were implemented in the 12.4(20)T version of IOS:
So the last available IOS for pre-ISR routers will be the 12.4(15)T version. For more information, go to cisco.com.
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