Now, when you add  a new user in the administration center for BPOS,  they will 25GB mailbox assigned by default (assuming you are assigning a mailbox to the user)

Previously, this was 5GB per user. This 5x increase for FREE.

Microsoft is always making the services bigger and better while keeping the costs waaay down. In fact the price recently dropped for BPOS to only $10 a seat. That's not a typo. I mean, just consider Live Meeting Standard which you get with the suite. You can invite 250 (as in two hundred and fifty) non-BPOS users to any meeting, doing voice and video (where allowed). TEN BUCKS a month including Exchange Online, SharePoint Online, Office Communications Online. You gotta love that.