It's very irritating to have new tabs created whenevef I go to my calendar or contacts. I only need one tab (one instance) of my mail. Fix this: decide how to implement the calendar and contacts function well or take them away (the latter would be a huge mistage!)
How does one delete an unwanted To Do in the calendar? I only see instructions for adding things. Reminders to exercise at a location I no longer go to can't be made to go away! (Who wants to be reminded of that?)
The lack of calendar and contacts functionality would cause me to change mail functions.