The deal scores you $20 off the cost of a 12-month subscription to the service, which offers multiplayer gaming, free games and other benefits.
Good until March 8, the deal lets you trade in an older Surface tablet toward the purchase of a new Surface Pro 3.
It's still free, thank goodness, but I'm not loving certain changes to the company's model.
Normally $900-plus, this Haswell Core i7-equipped system goes from laptop to almost-tablet with a simple twist.
Normally $349, this budget system goes from laptop to tablet and back again with an easy magnetic connector.
Holiday shoppers can save some bucks on a Surface Pro 3, various ultrabooks, Xbox One consoles and assorted accessories.
Normally $329, the PC that works as both a tablet and a notebook can be had for just $199 -- but only on Thursday.
The first 50 to buy the latest "12 Days of Deals" offer at a Microsoft Store will get two free games.
Buy a Fitbit Flex or Fitbit Charge, and Microsoft will throw in a pair of $40 earbuds at no charge.
Transformer Book Flips are $299 courtesy of Monday's 12 Days of Deals.