Office Web Apps + Hotmail = contextual content; see the full post for more new Hotmail features
Documents work just like photos. If you receive a document, you can now open it with the full power of the new Office Web Apps, right in Hotmail. Just click and view. Just as you do with photos, you can send up 200 Office documents of up to 50 MB each. Send PowerPoint presentations embedded with videos, Word documents rich with images, and more.
With the new Hotmail, you can attach an Office document to an email and have it stored on SkyDrive. Hotmail then sends the document via SkyDrive, so that you – and the people you send it to – can access it from anywhere regardless of whether they use a PC or Mac, have Office installed, use Hotmail or don't, or have smaller attachment limitations than the 10 GB per message allowed by Hotmail. No more worrying about whether that document is stored on the computer you have with you, the computer you use at the library at your office, in your dorm room, or elsewhere.