1. Co-authoring feature in Word, PowerPoint and OneNote for simultaneous editing.
2. Conversation View in Outlook combines all messages within a conversation thread, removes duplicate information and lets you delete current and future irrelevant messages.
3. Broadcast slideshow feature in PowerPoint enables you to present over the internet directly to anyone with a supported web browser.
4. When you recieve a meeting request in Outlook you get a preview of your callendar to show how the request affects other callendar items without leaving your inbox.
5. Much improved video editing tools in PowerPoint.