It covers the 2.x to 4.0(x) upgrade scenario - for upgrading to 4.0(3) and later there's a seperate version of FullDBImport than for upgrades to 4.0(2) and earlier. Just be sure to get the right one off www.CiscoUnityTools.com before you start.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...