1. Open the task (task: A personal or work-related duty or errand that you want to track through completion.) you want to set or clear a reminder (reminder: A message that appears at a specified interval before an appointment, meeting, or task that announces when the activity is set to occur. Reminders appear any time Outlook is running, even if it isn't your active program.) for.
2. Select or clear the Reminder check box. If you are setting a reminder, you can also enter a date and time.

If you set a reminder but don't set a reminder time, the default reminder time is used. To set the default reminder time, on the Tools menu, click Options. In the Reminder time box, select a time.

1. On the Tools menu, click Options.
2. Click Task Options.
3. Select or clear the Set reminders on tasks with due dates check box.

Note   If you assign a task (task: A personal or work-related duty or errand that you want to track through completion.) with a reminder (reminder: A message that appears at a specified interval before an appointment, meeting, or task that announces when the activity is set to occur. Reminders appear any time Outlook is running, even if it isn't your active program.) to someone else, Microsoft Outlook switches the reminder off so the person who accepts the task can set a reminder.