In Calendar you only appear to be able to enter appointment start times in half hour intervals so have to put actual time into the description box if not on a half hour. So a 9:20 appointment has to be entered as 9:00 with 9:20 in the description so ends up appearing as 9:00 9:20 in the Calendar. Previously it was much shorter intervals which were close enough to cover most eventualities. This is very irritating and a retrograde change. Users want changes that make the service more user-friendly not less so.
Does anyone else share this concern?
Please don't post the same question more than once. It can cause duplication of answers.
I have given an answer to your question on the BT Webemail Feedback thread.
See link which mentions how to change the calendar times.