Microsoft 365

• First Time Login

• Enable two factor authentication

• Check installed Product Key
• Setup Office 365 Email in Outlook
• Add new mailbox
• Using Office 365 DNS
• Setup a Catch All email
  • http://o365info.com/configuring-catch-all-mailbox-in-office-365-part-1-of-2-2/
  • https://o365info.com/configuring-catch-all-mailbox-in-office-365-part-2-of-2-2/
  • https://social.technet.microsoft.com/wiki/contents/articles/30462.catch-all-mailbox-office365.aspx
• Disable Password Expiry

Reference: https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/removing-user-from-restricted-users-portal-after-spam?view=o365-worldwide

• login office 365 admin portal
• go to Microsoft 365 security at https://security.microsoft.com/restrictedusers
  • if there is any user blocked, select it and click [Unblock]
  • it may take an hour to be effective

Need to connect to M365 via PowerShell to enable it. It will take some times (1 hour) to be ready. Then you could go back to the GUI to setup.