Omar Shahine @inside_skydrive writes:
SkyDrive already keeps previous versions of your Office documents automatically. But students, in particular, have asked for a way to recover any file—even those deleted by accident, by someone else, during a group project. So, we’ve added a recycle bin to SkyDrive.
Items in the recycle bin do not count against your SkyDrive storage limit. We save all items you delete in the recycle bin for at least 3 days. If the content in your recycle bin gets large enough to exceed 10% of your storage limit (which will be pretty rare), we’ll start to delete the oldest content (after it’s been there 3 days), and will permanently remove items from the recycle bin after they have been there for 30 days (and not restored).
Right now, the recycle bin feature is available from SkyDrive.com, and over time we expect the recycle bin experience to make its way to other SkyDrive experiences too.
We’re also putting the final touches on adding Excel surveys to SkyDrive. Like the recycle bin, this has been a top request from students in particular, as they’re great for getting suggestions for a group project or party, collecting feedback or research results, running a competition, and much more. And unlike competing services, you can easily use the power of Excel Web App, Excel for Windows, or Excel for Mac to sort, analyze, or chart the results of your survey.