In Thunderbird Calendar Month/Multiweek view, events that span multiple days are shown separately on each day. Outlook shows them as one continuous horizontal bar across the affected days, which is much easier to read.
This is important for shared company calendars, where users cannot change how events are created because the same calendar is used by many employees.
Please add an option to display timed multi-day events as spanning bars in Month/Multiweek views.