Online retail?!? This isn't 1998, when everyone thought Microsoft was going to be the gatekeeper to ecommerce, and there was universal naivety about these things. Microsoft has absolutely no business being in online retail. They shouldn't go anywhere near retail at all.
They also shouldn't be in advertising, media distribution, or social. The only company making any money in social, is Facebook. There is very little money in that market, and it's going to remain that way; social is a horrible business.
Media distribution is also a terrible business. Just ask Netflix: ~200 PE ratio, temporarily floating extreme bubble stock, with a whopping $266 million in net income after 20 years in business. They're the king of their segment and that's all they can earn. Pandora and Spotify also have horrible businesses, that have done nothing but bleed large amounts of red ink for a decade. Media distribution primarily profits the content owners, not the distributor. Microsoft should stay very far away from it.
Since when does it make any sense, at all, to try to do everything? It's a horrible business approach, and guarantees mediocrity. Trying to do all of those things is what hurt Microsoft from ~2000-2014.