Scheduling and managing events using Outlook.com calendar
There is one more thing. I have a gmail account as Apple account that does not match with my Windows account (hotmail). Maybe this has something to do with this bug because if I create an event in Outlook 365 desktop starting from my gmail account everything works flawlessly. I mean that the event created starting from my gmail account in Outlook 365 desktop does not turn into a meeting when edited with my iphone. I haven't tried changing my Apple account to match my Windows account (hotmail) to see whether this is sorted though.