"Spear-phishing" typically works by sending fake e-mails that look like legitimate correspondence, but which link to a malicious website or file attachment.

BBC: The White House as seen on 17 March 2010

The outbreak was attributed to a user opening an infected file attachment.

CNN: ExploreZip stings Marine Corps HQ - October 23, 19999

How do you place that attachment file into a cloud-based filesystem, and start to manage it on the cloud like its a network file?

FORBES: Microsoft Betting BIG On Cloud With Windows 8 And Tablets