Common misunderstanding that you need a "Microsoft" e-mail address (like outlook or hotmail) for a Microsoft account. It's just an e-mail address, Gmail works just fine.
Replying to @MotoWilliams
You can use your Gmail address as a Microsoft account. It's easy to set up.

Mar 12, 2020 · 7:16 PM UTC

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Replying to @jongalloway
But they restrict you if you use a custom domain
It is a common misunderstanding that To Do is just like Wunderlist. Wunderlist let two users have a shared list — and kept them synced. To Do sometimes updates —if both users have iphone apps open and running—and sometimes doesn’t. Prepare for some very unhappy grocery runs.