Where work gets done
By adding a couple of layers to the inner/outer loop analogy, I think we get a fuller picture of all the interactions that an individual may have within and outside of an organization. This model doesn’t capture all the apps in the Office 365 toolkit, but it should provide a fair representation. It also doesn’t perfectly provide a clear-cut answer to the question of what to use when. That’s okay in my book (or blog, as the case may be).