Why are some calendar events migrated to the primary Google calendar and not the original calendar? BitTitan Triage September 29, 2017 17:47 Updated Follow Why are some calendar events migrated to the primary Google calendar and not the original calendar? Answer:On the Google calendar, if the calendar event is not organized by the mailbox owner, that event can only be created on the primary calendar. Related articles Video: Google Apps to Office 365 migrations What calendars are migrated with my account? What is the best way to handle the G Suite All Mail label during migration? Why are my Google Calendar items formatted differently? How do I migrate calendars from Google to Office 365 with color? Comments 0 comments Please sign in to leave a comment.