You've probably seen posts joking about programming errors making things go sideways on 2/29—this is not just a joke. Microsoft To Do scans task titles for clues to due dates and reminder times. This is what happened when I dated a task for today.
The number-one thing I liked about Microsoft To Do was list sharing; up until yesterday, you could share lists from a Personal Account to a Work or School Account—meaning I could own all my personal tasks, keep all of my work tasks in my employer's tenant, and STILL SEE THEM ALL IN ONE PLACE.
This worked until this morning. Today, all of my personal lists are gone, and when I tried to re-share, I got this bullshit.
@bomkatt@mkj That's a good guess. It would 100% be possible to erect better walls between different accounts' lists rather than to restrict it to intra-tenant sharing only, but it would surely also be more work; they may be putting all of their resources into aligning with AI-related features (which seems to be the mandate throughout Microsoft at the moment).