Microsoft is either rolling out or testing a new feature for Outlook.com owners that will allow them to save any file attachments in their email directly to their OneDrive account.
According to Neowin, this new Outlook.com feature is apparently available to some users, but we have been unable to check it out ourselves, This would suggest that Microsoft is either slowly rolling this out or is testing it before an official launch sometime in the near future.
If and when it does go live, it will offer a third option for file attachments in Outlook.com. Currently, you can either view an attachment or download it to your PC or mobile device.
We will keep an eye out for when Microsoft makes this new feature official. If you can access it now, let us know about it in the comments!