I purchased Office 365 subscription recently, and wanted to bind my own domain, because wanted to use e-mail address like alias@some_custom_domain.com If you want to use custom domains, manual page suggest to change name server records for your domain to ns1.bdm.microsoftonline.com and ns2.bdm.microsoftonline.com. After doing this you can use aliases with your domain for Exchange mail and Lync. If you don’t want to change by any reasons name servers for your domain, just go through steps: 1) open ......