Export ToDo to a pst File as a backup

Hello

I made backups from ToDo over a link https://outlook.live.com/mail/0/options/general/export

so I exported a pst file which I could reimport in outlook.

Since february 2023 this do not work any more. No support / no answer!

It is a big problem for me!

Has any one else be in contact with the support

Daniela