In order to convert mind maps from iThoughts format (.itmz) to MindManager format (.mmap), you have to use some tool with support of both of these file types, for example MindGenius. But it is likely that some other tool may be able to perform this conversion as well.
Convert iThoughtsX mind-map document to MindManager mind map.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert itmz to mmap on Windows
MindGenius is business mind mapping software that helps you capture, visualize and manage your ideas and information. It was designed specifically to meet business needs and this understanding comes across in every single piece of functionality, all added to assist with the common business processes that you face every day.
Convert from itmz file
to mmap file
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.