Microsoft's DNS server servers are apparently failing to respond to requests, returning "no record" errors. This means that you can't access sites like Hotmail.com, MSN.com, and Live.com. It's unknown how widespread this outage is at this time. Currently msn.com, live.com, hotmail.com, and outlook.com, azure.com, and microsoft.com are all known to be impacted. It's very probable that all Microsoft domains are currently unavailable.