I do know the exporting & importing method, but the defects are:
The "create time, update time info" of notes will be lost;
The structure of notebook-stack will be lost;
The worst, is the Evernote internal links (refers another note from one note) will be lost!
Because of the huge work to re-construct the internal links among the notes, this work will be a nightmare! Is there a way to perfectly do the migration?
Say I want to migrate data from account A to