Microsoft'un kullanıcıların cihazlar arasında günlük görevleri düzenlemelerine ve yönetmelerine yardımcı olan bulut tabanlı bir görev yönetimi uygulaması.
Thank you for the extra information. t confirms that your lists still exist and are not deleted, since your friends still see them and your name appears as the owner. That’s very helpful.
The message "Your lists are preparing..." means the Microsoft To Do app is trying to sync your account's task data from the server but is stuck most likely due to a the Outlook issue happened for the last 10 hours.
The good news is that Microsoft is aware of the issue and is already working on it.
You can stay updated by checking the official Microsoft Service Health page here:
https://portal.office.com/servicestatus
Thanks for your patience and understanding!