A good example of this is delayed sending of email. Instead of sending the email when you hit "Send", you want to automatically send the email at a later time. Maybe you don't want to give someone the impression that you respond to their emails instantly. Or your press release goes out at midnight but you don't want to be awake at such a late hour.
This feature already exists. In Outlook 2007, it's called "Delay Delivery". When you're composing a message, click the icon in the menu bar, then check "Do not deliver before". In Outlook 2003, click "Options", then "Do not deliver before".
This is a great illustration of both Outlook's greatest strength and greatest weakness. I can easily imagine the corporate IT meetings in the mid-1990s where admins compared the feature matrix of Outlook to that of Lotus Notes, and decided to go with Outlook. Microsoft got everyone to use Outlook partly because it had a complete product with every feature box checked. On the other hand, it created a client with a lot of complexity, where every new release needs to carry the weight of the last one to assure backwards compatibility. Complexity leads to long cycles, and slow products. However, it can also lead to market dominance.