Using Classic Outlook on Windows for personal email, calendar, and contact management
+1 for restoring the "Never change the message background color" in New version of Outlook. This sort of feature should not be abandoned by a software upgrade. While my eyes appreciate dark mode in most apps, I need the reading pane of email to remain white. This was a simple checkbox next to the theme in previous version of Outlook. The new version lets you change reading pane background one message at a time, but the selection does not stick. I'd be fine with the option as-is if it stayed in desired state until clicked again.