A task is an item that you create that you want to track until it's completed. Use To Do in http://Outlook.com to create, edit, and manage tasks.
Note: The instructions and imaged below may change overtime as Microsoft introduces updates. However, the core content will remain the same.
Choose your version for instructions
The instructions are slightly different depending on whether you're using To Do in http://Outlook.com or the classic Tasks. Choose the version you're using to see the instructions that apply to you.
The task icon will look like this…
Instructions for To Do in Outlook
Microsoft To Do is now integrated with Outlook. To Do is taking the place of Tasks and includes smart lists. Smart lists are filtered lists that make it easier to track tasks and organize your day. With To Do integration, you can quickly organize your tasks by adding them to My Day, marking them as important, or adding them to new lists that you create. There's even a list for tasks that you've assigned a date to. To get started, open Outlook or login into Outlook on the web at 365.mylmc.org.
To Do is a bit different from the classic Tasks in Outlook. Some features are different, and others will be added as To Do is rolled out.
To view and manage your tasks, select 
To Do at the bottom or side of the navigation pane.
The To Do page includes four default tasks lists, plus optional tasks lists and any tasks lists that you create.
My Day is a Smart List that can help you track the tasks that you want to get done today. It's empty at the start of each day by default, so that you can organize your day by adding tasks to it. You add existing tasks to My Day by right-clicking a task and choosing Add to My Day, or by dragging a task from any other tasks list to My Day. Tasks that appear in My Day are kept in their original list.
Note: My Day is cleared at midnight every night. Tasks that appear in My Day are stored in other tasks lists, so they aren't deleted when My Day is cleared.
Suggestions are tasks that aren't completed that you might want to add to My Day. To see suggested tasks, go to My Day, then select Suggestions at the top of the page. Select the plus sign (+) next to a task to add it to My Day. Select Done to close Suggestions and return to My Day. Suggestions includes tasks that are due today or in the future, are overdue, were previously moved to My Day but not completed, or that might be relevant to start working on.
Important is a Smart List that includes tasks that you've marked as important. You can mark a task as important by right-clicking it and selecting Mark as important, or by selecting the star icon next to it.
Planned is a Smart List that includes tasks that have a reminder or due date and have not been marked as complete. Tasks that you create with a reminder or due date will automatically appear in this list. The only way to add tasks to this list is to assign a reminder or due date to an existing task.
Tasks is the list where new tasks are stored by default.
Flagged Email is an optional list. When on, messages that you've flagged in Mail are copied to the Flagged Email list as tasks. You can turn the Flagged Email list on or off by going to Tasks, then selecting Settings at the top of the page, going to Connections and using the slider to turn the Flagged Email list on or off.
You can add new tasks by selecting a tasks list, then choosing the plus sign next to Add a task and entering a description of your task. If you add a task to a Smart List, the task will be saved in Tasks and linked to the Smart List you were in when you created it.
Note: You can't create new tasks in Planned. To add a task to Planned, add a reminder or due date to an existing or new task.
Select a task in any list to see all of the available options for that task. You can do things like add additional steps, add them to My Day, make them repeating, add a due date or reminder, and add a note.
Drag a Message to Create a Task