All activities can be found listed in the Calendar module.  Users can create filters to see only specific activities or use the preset Upcoming and Overdue Filters.  Users can set the Activity Status as ‘Complete’ directly from the list view by clicking the action slider. 

Managing Calendar and Activities [Video]

For email and calendar integration, if the reverse or bi-directional sync option is selected in the email and calendar integration block.  See the additional features - Here.