If you belong to mailing lists, you'll appreciate this new feature in Outlook 2010, which you also get with OWA 2010. Sometimes, the group will engage in discussions that don't interest you at all. Now you don't even have to see them. Just select Ignore Conversation from the action menu and any further messages in that conversation will be automatically deleted. This can be a real time-saver.
1. Right-Click the message.
2. Select Ignore Conversation.