Is r20swj13mr.microsoft.com legitimate?

We recently noticed intermittent HTTPS traffic over port 443 from Internet Explorer 11 to the URL r20swj13mr.microsoft.com.  We've since run full AV scans that did not detect any risks.   

Does anyone know if this is a legitimate site?   It uses the Microsoft domain but looks odd.  We've researched the site but are unable to find anything definitive.  Is the site associated with any viruses or malware?

We'll apologise in advance if we've posted to the wrong forum.

Thanks,

Wally