Open Microsoft Outlook from your task bar or “Start” menu. Go to the “File” menu and choose “Import/Export” to open the “Import/Export Wizard.”
Choose “Export to a File” from the list of options, and select “Comma Separated Values (DOS).” If prompted to install a translator, do so by following the installation windows that come up automatically.
Select “Tasks” in the “Select folder to export from” box. Choose the “Desktop” as the folder to save the file into, and type in a name for the file that will make it easy to locate, such as "Outlook Tasks," then click “Next.”
Click the “Finish” button on the next screen to export the “Tasks” file to the desktop. All of the items stored in the “Tasks” features of MS Outlook will be exported to file.
Open a web browser and go to Google Calendar (see "Resources," below.) Enter your Gmail ID and password to sign into Google Calendar.
Click “Add” in the lower right corner of the “Other calendars” pane of Google Calendar. Choose “Import calendar” from the menu that comes up.
Press the “Browse” button and go to the desktop of your computer. Double-click the task file to upload it to Google Calendar and click the “Import” button. All of the dated items stored in the “Tasks” file will be imported into the Google Calendar.