I couldn't have phrased it better, so I just steal what someone else wrote about that:
"My Outlook calendar appearance has suddenly changed overnight, from a clean, white appearance to grey with grid lines. I've tried all of the usual settings in calendar options to change the appearance back to the previous one but to no avail.
Does anyone know how to revert to the cleaner view? This new look is untidy and distracting."
Posting it here, because there is no answer at answers.microsoft.com, (as is tradition).
Changing the color theme does not work. It just shifts the colors around.
The biggest issues I have with this view is that it's a visual mess, hard to read and distracting. And that the fine line showing you the current time is gone completely.
