Edit: It's back up now.

Yup, it's pretty broken, though it is still up some places.

Outlook.com:

  Grapevine TX, United States (bigguy.gte.net) - Down
  Sacramento CA, United States (CalWeb) - Down	
  Providence RI, United States (Verizon) - Down
  Pasadena CA, United States (Mindspring) - Down
  Mountain View CA, United States (Google) - Up
  Vancouver BC, Canada (Radiant) - Down
  Recife, Brazil (Hotlink Internet) - Down
  London, United Kingdom (Legend Comm) - Down
  Lille, France (Nordnet) - Down
  Merzig Saarland, Germany (Probe Networks) - Up
  Milan, Italy (BT Italy) - Down
  Ankara, Turkey (TTNET) - Down
  St. Petersburg, Russia (Uni of Tech & Design) - Up
  Karachi, Pakistan (Supernet) - Down
  Delhi, India (Tikona Infinet) - Down	
  Bangkok, Thailand (TOT) - Down	
  Petaling Jaya, Malaysia (Clear-Comm) - Down
  Beijing, China (China Unicom) - Down
  Sydney NSW, Australia (Exetel) - Down
  Collingwood VIC, Australia (Pacific Internet) - Down
  Auckland, New Zealand (ICONZ)  - Down

https://www.whatsmydns.net/#A/outlook.com