Add my Microsoft 365 email to Outlook Add your Microsoft 365 email to Outlook 2016 (or newer) for Windows PC. Then you can send and receive business emails your Desktop version of Outlook. Open Outlook. Select File, and then select Add Account. Enter your Microsoft 365 Email Address and select Connect. Enter your Microsoft 365 password provided by TEKYHOST and select Sign in. If you have been notified that TEKYHOST enabled multi-factor authentication (MFA) for your account then verify your account with on of authentication methods.