An implementation of the Microsoft OAuth flow using the v2.0 authentication endpoint preview
Add the package to meteor by running.
meteor add ghobbs:microsoft2
v2.0 is in preview right now, and it only works with a handful of APIs. However, the v2.0 API works with the super-useful Graph and Outlook APIs, and provides a single interface for servicing work, school and personal Microsoft accounts. If you want to plug into Outlook and reach the most users, the v2.0 API might be your best bet, even though it is in preview (see references).
The usage is pretty much the same as all other OAuth flow implementations for meteor. It's almost completely copied from Q42's package for authenticating with the v1.0 API, which was inspired by the official Google meteor package. Basically you can use:
var callback = Accounts.oauth.credentialRequestCompleteHandler(callback);
Microsoft.requestCredential(options, callback);