So focusing its deployment in the real of medium to large enterprise, it has some advantages that may cut out the need to take a laptop to-and-from work everyday.
As for who will go for this - well - I can think of several examples. Sure, people are edgy about data security, but how is hosting out-of-house going to compromise this? Aside from the fact that there might be a link that the world can use to 'arrive' at your server containing lots of sensitive data?
My next question - will it be available/accessible only through whatever entity developed it, utilizing their server infrastructure, or will it be provided as a software package (or whatever) that companies can install/run on their own server infrastructure? I guess these aren't really questions we can answer.