It can be anything! An apex, subdomain, or even a URL.
Results for*.security.live.com.office.default.bt.myshn.eu
www.*.security.live.com.office.default.bt.myshn.eusecurity.live.com.office.default.bt.myshn.eulive.com.office.default.bt.myshn.eucom.office.default.bt.myshn.euoffice.default.bt.myshn.eudefault.bt.myshn.eubt.myshn.eumyshn.eueu