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
• Allow user send as alias

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.

https://docs.microsoft.com/en-us/powershell/exchange/connect-to-exchange-online-powershell?view=exchange-ps

Connect M365 via PowerShell

• Run Windows PowerShell as Administrator
• connect to your M365 with this command, replace navin@contoso.com with your username

PS C:\Windows\system32> Import-Module ExchangeOnlineManagement
PS C:\Windows\system32> Connect-ExchangeOnline -UserPrincipalName navin@contoso.com

• Run Enable-OrganizationCustomization

PS C:\Windows\system32> Enable-OrganizationCustomization

The output may display “This operation is not required. Organization is already enabled for customization.”. It is okay and just wait an hour for it to be completed.