Am I right in thinking this won't work? I am currently running 4.0.2a but I upgraded to OS 4.2 so I could get secured against the most recent security patches...
You can upgrade your servers from Cisco CallManager release 3.3(5), 4.0(2a), and 4.1(2) to Cisco CallManager release 4.1(3). See the "Compatibility Matrix and Supported Upgrades" section for more information about supported upgrade paths.
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