Related: If you send an e-mail to "Some Name with something interesting" <a.person@company.org> and company.org runs Microsoft Exchange and a.person@company.org

Related: If you send an e-mail to "Some Name with something interesting" <a.person@company.org> and company.org runs Microsoft Exchange and a.person@company.org is in Active Directory, then Exchange will erase "Some Name with something interesting" <a.person@company.org> and replace it with a pointer to Active Directory and you will never see "Some Name with something interesting". Like the opposite effect as discussed here. o365 is probably doing the same