It can be anything! An apex, subdomain, or even a URL.
Results for*.beta.officeapps.live.com.office.prod.link4tu.myshn.eu
www.*.beta.officeapps.live.com.office.prod.link4tu.myshn.eubeta.officeapps.live.com.office.prod.link4tu.myshn.euofficeapps.live.com.office.prod.link4tu.myshn.eulive.com.office.prod.link4tu.myshn.eucom.office.prod.link4tu.myshn.euoffice.prod.link4tu.myshn.euprod.link4tu.myshn.eulink4tu.myshn.eumyshn.eueu