Importing tasks to Tasklist
You can import tasks to Tasklist by importing them to Outlook, and setting Tasklist to create corresponding Tasklist tasks.
First set Outlook to import tasks by clicking on Options in the Tasklist ribbon bar, and selecting Create a root Tasklist list:
This will import tasks as root (top-level) tasks. You can move them later.
Next, save your source file as a comma-delimited (csv) file. For example, if you have a list of tasks in Microsoft Excel, use File > Save As, and select "CSV (Comma-delimited)" in Save as type. Remember where you saved the file.
Close the csv file, or Outlook will not be able to import it.
Go back to Outlook, and select File > Open & Export > Import/Export. In the Import and Export Wizard, select "Import from another program or file," and press Next.
Select "Comma Separated Values," and press Next.
Browse to the csv file that you saved previously.
In the options radio group, check "Allow duplicates to be created," and press Next. Select your Tasks folder as the destination folder, and press Next.
Check the box to import the tasks, and press Map Custom Fields.
In the next dialog box, map columns from the csv file to fields in your Outlook tasks:
Map fields by dragging and dropping the columns from your csv file on the left on to the task fields on the right. At a minimum, you must drag at least one field from the left on to the Subject field at the right - otherwise, the names of your imported tasks will be empty. Click OK.
Outlook will import the tasks, and Tasklist will make a copy of them in Tasklist. They are imported into Tasklist as root (top-level tasks). If you want to move them, multi-select them (click the top-most task, hold down the Shift key, and click the bottom-most task), and drag them to wherever you want them on your list.