Again, that's isn't outsourcing. Outsourcing is not running your own sales and paying a 3rd party to do that. Strategy and execution
If you are selling your own product and co-selling with a partner. That is not outsourcing. That's another channel in addition to your direct to market sales, ironically called channel sales.
With a co-sell like this. The main leverage for the partnership is that Livetiles with get access to customers faster, doors opened quicker leveraging the Microsoft relationship and then the LVT account executive will run the sale and closure.
Trust me. I've been doing this SaaS sales thing a while