My client maintains two calendars; his work calendar, in his Office 365 mailbox and his family calendar, in GMail. His wife shares access to the Gmail calendar using the web browser on her computer.
Today we found that somtime in the last 24 hours, a recurring meeting on his Office 365 mailbox moved by itself over to the Gmail calender - it was removed from his O365 calendar and appeared on his Gmail calendar. He says he didn't move it.
His iPhone is configured in the native calendar client to view both calendars, and I know that with the Calendar client you can change calendars for an event. Has anyone encountered this where the iPhone or another iOS device seems to do this by itself?