Outlook Calendar Daylight Savings. It appears you’re encountering a known issue with outlook calendar where the time difference between primary and secondary time zones doesn’t update correctly on the day daylight saving time (dst) starts. After daylight savings time, the time zone listed in outlook calendar differs between week and work week.
I’ve set up my outlook.com to be in the same timezone (melbourne / utc+10). Switching between the two settings shows two completely different.