OSS is not the same as 'Open Source Operating System. While I wouldn't say there's much OSS in the Band I think the OP's intent is that Microsoft is being more open
"Plays well with others.
We've established partnerships with key service providers who embrace our vision of healthier living. And we're open to even more. Microsoft Health as a platform will be strengthened by broader collaboration from device and service partners. See how connecting to the partners we have today can make your Microsoft Band experience even more amazing."
"Plays well with others. We've established partnerships with key service providers who embrace our vision of healthier living. And we're open to even more. Microsoft Health as a platform will be strengthened by broader collaboration from device and service partners. See how connecting to the partners we have today can make your Microsoft Band experience even more amazing."