Issues resolving outlook.office365.com

[Phil Mayers]

On 16/06/16 13:01, Tony Finch wrote:
> Phil Mayers <p.mayers at imperial.ac.uk> wrote:
>>
>> For what it's worth, I've been aggressively monitoring DNS resolution of
>> outlook.office365.com from all four of our recursives, both A & AAAA, once a
>> minute for the past 3 months.
>
> I wonder if you would notice more problems if your query interval is
> greater than the TTL. (And if your servers are ever quiet enough!)

The servers are never quiet enough. There is always continuous query 
load for that name at <TTL intervals, at least when I checked a month 
ago or so.

Add to which the prefetch thing.