If I create a recurring event and have 1+ invitees the event saves and sends to invitees. If I accept the event on the invitee side the cal app updates to a check mark showing it was accepted. The problem starts when you try to update one of the instances of the recurring event. I can say make a recurring event for everyweek on monday at 1pm. After that I go and change next monday to 2pm. I select this event only in dialog popup. It will appear as it sent the update to the invitees however it never does. The event shows changed time on OSX cal however it does not update the office365 calendar neither in OWA or any other device connected. It also does not update the invited persons calendar. My setup is OSX Sierra connected to office365. I have had a ticket open with both Apple and Microsoft which say its neither of their problems. I want to strangle them. I can't believe I am the only one that has this happen. Thoughts?