Since about 05:00 UTC on 11 March we have noticed that emails to Microsoft’s free email domains — hotmail.com, outlook.com, msn.com, live.com and various other domains in various other TLDs — have been and are being significantly delayed, sometimes by twelve hours or more. This is not a problem with our mail servers; it is Microsoft that are deferring and refusing deliveries. If you look at their “service health” page, they claim that “Everything is up and running”, but this is not accurate — or true.
We are monitoring the situation, but there is little to nothing that we can do. We ask you to have patience when communicating with people who use this free email service, and if Microsoft cared to communicate with the public, we’re sure they’d ask that too.