Thank you for the updated information and the picture. My first thought is that it is a scripting error that the browser isn't able to handle, as you and your friend are both using an older iPad.
Could you try looking at the following and verifying the settings are correct?
Go to Settings > Safari > Advanced, and see if JavaScript is enabled.
If it isn't, then turn it on.
If it is enabled, then I would suggest installing another browser (I prefer Edge, but Chrome would be good, too). Try opening Hotmail again, and see if it is rendering correctly in the alternate browser.
Another thing that you could try is to view it in Desktop mode, and see if the site loads that way.
Please let me know if any of these suggestions work, or if I should keep exploring other options.
Warm Regards,
Joe