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Not really sure what amount of "effort" is needed to upgrade to 64-bit. You simply run the 64-bit installer instead of the 32-bit installer (assuming, of course, that you're running a 64-bit version of Windows) and then optionally uninstall the 32-bit version. It uses all of the same settings storage and everything, so when you start up the 64-bit version the only indication that anything has changed will be that it says "calibre 1.3 [64bit]" in the bottom left corner.
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