MindManager can read maps from MindManager 2002 MindManager X5 and MindManager 6 without any changes to the maps. MindManager 2002 files have names that end in .mmp, whereas MindManager X5 and MindManager 6 maps will be named as .mmap files.
No special procedure is needed to open maps from these earlier versions, but if you used any custom add-ins from third-party vendors on your maps, you will need to get updated versions of these to use.
You can also Save a map in 2002 format.