Keep in mind you'll need to restart Outlook after adding or changing any event code.

You need to manually set up a task with a reminder time 10 minutes into the future. I suppose you could do it programmatically, perhaps when Outlook is started, but I assume you want more control.

If you want to test out the Reminder Event handler, just set up a dummy task with a reminder 1 minute from now. Just wait for the event to fire.

To set up the "live" code, take out the MsgBox part and substitute it with your custom code. Then, before the event handler ends, you need to create another task with a reminder 10 minutes into the future. You may also need to dismiss or "mark complete" the currently firing reminder.