How much data does Microsoft keep??

I just downloaded Microsoft to-do to my phone, as I have taken to using it at work. I went to open it, and it gave me a list of accounts it thought I may want to sign in on. The list was LONG, full of accounts I long *deleted*.

5 were deleted accounts, at least 3 of them I haven’t touched in half a decade either.

I am really confused why they’d think I’d wanna log into “stardestroyer6969” anymore since …

accounts data list may microsoft phone privacy sign taken thought work