I also have not changed anything nor had any error messages.
I used to use Hotmail, which I liked. Then, a few months ago, it changed (not my decision) to this new outlook. On my PC and laptop, I get the desktop view. But on my mobile devices, it just forces the mobile view* with no option anywhere to change to desktop
view.
There's no error message, and desktop view works just fine on other sites (e.g. reddit). Furthermore, on Chrome on my phone, I have the 'Request desktop view' option selected, so all sites appear in desktop view - except for outlook!
I don't recall making any changes in profile.live.com. It has just always been stuck on mobile view since the outlook "upgrade" was forced on me.
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*The mobile view is terrible. I cannot move emails while maintaining the unread status (I have to open email, move it, then set to unread). I cannot select multiple emails and drag them to a folder, because there are no checkboxes to select. The first email
is auto-opened, because there is no 'top view' with checkboxes. The small mobile screen is divided VERTICALLY into two lists (a list of emails on one side and an unremovable preview pane on the other) - both lists are unreadable, because it has split a small
screen in half! I cannot quickly sort or view folders, because opening the folder view adds a THIRD vertical column to the already-unreadable mess! The whole thing is a joke.
There needs to be an option to use the desktop view - it's slow, buggy, and rubbish compared to the old Hotmail one, but it's not as much of a trainwreck as the mobile view.