Tasks/Calendar missed from SharePoint Online my site

Problem:

Tasks and Calendar missed from Newsfeed page:

Solution:

1- Login to http://ift.tt/1Tzmz8Q

2- Go to the gear in the top right, click on Site Settings, then go to Manage site features under Site Actions

3- Activate "Workflow Task Content Type" Feature and "Project Functionality" as shown below:

4- Now the you have both Tasks and calendar in Newfeed page:

by Sara Safari via Everyone's Blog Posts - SharePoint Community