I found this brief detail from a forum regarding The upgrade process, latter i will more details. courtesy cukon.
Yes it is possible to upgrade directly from CCM 4.2 to CCM 6.You need to download DMA (data migration assistant) tool from cisco, then you start to run this tool on CCM 4.2 publisher and output of this tool is file with CCM configuration, then you can install CCM 6.x, installation process ask you if you want to make fresh installation or you migrate from old CCM 4.x, you choose second option and installation process will ask you for file from DMA tool (file must be stored on some network directory). After CCM 6 published is installed you must add subscriber on the new CCM web admin and then you can install it...thats all :-)
About licences: licenses are migrated automatically based on number of endpoints in CCM 4 (you can add some virtual phones in CCM 4 before use DMA tool if you want to have more DLU licences in CCM 6 :-) ) to the new CCM6.At the end you must download these "migrated licences" from CCM6 and use it with ordered upgrade PAK from cisco on cisco WEB.Output of this will be true CCM6 licences which you must upload back to CCM6.
Thats all :-) Good for you will be upgrade guide which you can download from cisco pages.
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