It can be anything! An apex, subdomain, or even a URL.
Results for*.officeapps.live.com.office.o365-prod.phoenixprod.myshn.eu
www.*.officeapps.live.com.office.o365-prod.phoenixprod.myshn.euofficeapps.live.com.office.o365-prod.phoenixprod.myshn.eulive.com.office.o365-prod.phoenixprod.myshn.eucom.office.o365-prod.phoenixprod.myshn.euoffice.o365-prod.phoenixprod.myshn.euo365-prod.phoenixprod.myshn.euphoenixprod.myshn.eumyshn.eueu