Microsoft Outlook's Calendar gets a refurnished interface similar to Trello
Outlook 2010 Share Calendar. Select add, decide who to share your calendar with, and select add. Web select calendar > share calendar.
Select add, decide who to share your calendar with, and select add. Choose a calendar to share. Web select calendar > share calendar.
Select add, decide who to share your calendar with, and select add. Select add, decide who to share your calendar with, and select add. Web select calendar > share calendar. Choose a calendar to share.