I installed iOS 9 (then 9.1). After that when i edit a calendar event on my iPhone (6 plus or 5s) it appears as a Invite in outlook (2013) on my PC. Got Office 365 that i manage myself. Really wierd. I got full rights read/write (set to owner) so it doesn't seem to be a owner issue...
Any ideas why this happens?
I tried with an old iPhone 4 (iOS 7.1.2) and that does not change the event.