History
IOS XR was announced along with the CRS-1 in May 2004. The first generally available version was 2.0; the first version generally available for the 12000 router series was 3.2. Version 3.9 was the first generally available version for the ASR9000 series. The most recent release is 4.2 which was released on December 23rd, 2011.
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—Mao Zedong (1893–1976)
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“The history of all hitherto existing society is the history of class struggles.”
—Karl Marx (1818–1883)