It is important to have the feature to import and export from Excel!
In order to be capable to share information with other team members it is essential that all the information can be imported/exported to Excel.. the tasks in special the Schedule
Andreas Ha commented
The export function is of almost no value if there is no import function. This should definitely be added, since there is no other option to backup (and restore) planner data
Brett M commented
Import part is covered by this User Voice item (which has way more votes so is likely to be looked at first):
Bernd Großhans commented
Excel export is already implemented (see https://planner.uservoice.com/forums/330525-microsoft-planner-feedback-forum/suggestions/11116770-export-to-excel), although the current implementation is incomplete, at least comments are missing.
Importing from Excel would also be helpful.