Seriously Microsoft, handle your OAuth took more of my brain power than Facebook, Google, GitHub, Twitter combined. Why ??????

What? All you have to do is get a generic OAuth client for your language, and run discover on https://login.windows.net/common/...

And you can use the same client for every OAuth provider (google, fb, twitter, ... all offer the same kind of discovery), instead of installing a shitload of SDKs for each provider, and getting all bent out of shape when MS for once doesn't bother with all that vendorlocking bloat.