Will it be an add-on, or installed in the base OS?

If it's installed in the base OS, will there be a control panel to disable it?

If it's an add-on, I'll be happy (because I can simply choose to not add it, or to remove it at some point).

If it's not an add-on, but it has a control panel (or something similar) where I can completely disable it, then I'll be happy with that.

If neither of those is true, I wont be happy about it. Choice is best. Expanding our choices of apps by having it available is good. Retaining our choice to not have it at all, and not worry that it impacts us on some hidden level, is also good.

(and, frankly, as much as I hate MS, I am undecided about whether or not I'd use it)