Using classic Outlook for Windows in business environments
This change is really bad. I get around 400 emails per day and I need to go through deleting them either based on sender or subject, or flagging based on the same information. This makes it necessary for your eye to travel along the whole line of the email to make sure it is the right one etc. It also makes it much harder to scan down for flagged emails to see what to deal with next as your eye has to flick back and forth over the whole width of the page.
Just an appalling change and makes it very hard to use in the way I have grown accustomed to over the last 20 years. At least provide configurable columns so users can choose. This has just tripled the time I have to spend on email and made it harder on the eyes.