Support the changing of staff email.

Please add support for changing the email address of any staff and preserving the historical calendar item assignments made to the old address. When changing a staff email, it would be best for the calendar event's in the system to update, and reflect these changes to calendar events that the user is an organizer, or attendee of.

Currently, inside of Neos whenever you change the email in office 365 for a specific staff user Neos will visually remove the staff in question from those events in Neos from before the change because the new email address is not linked to a staff profile even though it may be the same mailbox the staff profile was activated with.