Having the ability to download attachments directly from your device is something Windows Phone has been good at for years, and it seems WP7 will have an improved way of handling this. 1800PPC recently posted a video of the new OS running on some developers devices and Pocketnow brought to our attention the part of the video where the guy shows off the email attachments and it being downloaded (2:36 in below Video)

Read more from the original source:
Windows Phone 7 Email Attachment Handling