Open the Tools menu and choose Options.
The Options dialog box opens with the Preferences tab displayed. To change the default reminder lead time, click the down-arrow button next to Reminder Time field and choose a new lead time.
To make other changes, click the Task Options button.
To change the default color for overdue tasks and/or completed tasks, click the down-arrow button next to the field and choose a color.
If you like, you can customize what color is used for overdue and completed tasks, whether reminders are set, and other options.
Getting Help on Options
If you are unsure what a particular option does, right-click the option and select What's This? to view a brief description.
To disable any task options, such as whether status reports are sent, uncheck the appropriate check box.
Back in the Options dialog box, click OK to close it.
Understanding Default Options
By default, Outlook keeps a list of any assigned tasks, sends status reports when assigned tasks are complete, and sets a reminder for any task for which you enter a due date. You should set these defaults, however, to match your work style. You can always override these options for individual tasks.