I’m having the same problem & it started today, I noticed this morning, it came up with log into your outlook account which it does every now & again so i did not think anything of it, but didn’t work & I noticed the last email that came through was 8am, & then after trying a few times I’ve lost everything, all my older emails, flagged emails ect.. this is my Mail account on my iPhone so I went onto my outlook app, still nothing, & I went onto google to log on & cannot get it to work. I’ve re-started my phone, checked for updates ect, But my husband who all has all his emails on outlook, work & private his is all fine. I have been panicking thinking I’ve been hacked but is there a problem with outlook? & if so can they tell us what is going on & when roughly do they think this will be sorted???