Figuring out Yammer Guest and Externals - PLEASE take a look at this matrix and add your 2 cents. It is not yet worded for end users but I think I may have sorted things out in my head with Externals/Guests and Yammer (at least until things change again). It is very important that I am able to answer these types of questions for my organization regarding externals and Yammer. I am hoping some of this will be clarified by Microsoft documentation soon. O365 connected groups has added a new level of complexity. The attached file has the matrix and addtional information in paragraph formating.