For those of you who have tried the new Office, you’ll know we made it easy to quickly save your documents to SkyDrive and get a link to share with others—earlier today we made it even easier for people to share and edit documents in the Office Web Apps by not requiring them to sign in with their Microsoft account.
Dropping the requirement for a Microsoft Account can only make this service easier to use.
I'm still debating which version of Office 2013 to get. However, the Save to SkyDrive option has been available in Office 2010 for a while now. I must admit that I haven't used it for much other than OneNote syncing.