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A comment on Outlook.com DNS records disappeared.

Re:Outlook.com DNS records disappeared by mrmondo on Thursday November 21, 2013 @06:01PM (#6778164)
Yeah, dropping all your NS records from your domain will do that;

  $ dig NS outlook.com

  ; <<>> DiG 9.9.3-rpz2+rl.13214.22-P2-Debian-1:9.9.3.dfsg.P2-4 <<>> NS outlook.com
  ;; global options: +cmd
  ;; Got answer:
  ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 8538
  ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0,   ADDITIONAL: 1

  ;; OPT PSEUDOSECTION:
  ; EDNS: version: 0, flags:; udp: 4096
  ;; QUESTION SECTION:
  ;outlook.com.            IN    NS

  ;; Query time: 28 msec
  ;; SERVER: 10.51.20.100#53(10.51.20.100)
  ;; WHEN: Fri Nov 22 09:58:48 EST 2013
  ;; MSG SIZE  rcvd: 40
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Re:Outlook.com DNS records disappeared by natevancouver on Thursday November 21, 2013 @06:13PM (#6778216)
SERVFAIL doesn’t mean they dropped the records (that would be NXDOMAIN). It does mean their nameservers aren’t responding.
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Re:Outlook.com DNS records disappeared by larrys on Thursday November 21, 2013 @08:28PM (#6778704)
...which can be verified (as I did earlier in another thread) by querying the nameservers directly.

https://news.ycombinator.com/item?id=6778272

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