Task Notification Alerts/Reminders – would like a dialog box to show up on screen until I click “Dismiss” or “Snooze”

I just switched from Windows Outlook to Mac Outlook and am almost ready to go back to using Windows Outlook with Parallels.  One thing I'm really missing is having a big notification/alert dialog box with my reminder show up on the screen 15 minutes before a task.  This is what Windows Outlook did.  Right now, it seems my only option is to have the list of Office Reminders open all the time and then constantly check it to see if some reminder just came up.  Under System Preferences, it seems the only option for notification alerts is for e-mail, not tasks.   Am I missing something?