Baixar e instalar o Microsoft Online Services Sign-in Assistant e Install Windows Azure AD

For single user

Connect to Windows PowerShell using Admin credentials

Connect-MsolService

Set-MsolUser -UserPrincipalName <user ID> -PasswordNeverExpires $true

For all users

Get-MSOLUser | Set-MsolUser -PasswordNeverExpires $true

How to check whether the password is set to never expire

For single user

Get-MSOLUser -UserPrincipalName <user ID> | Select PasswordNeverExpires

For all users

Get-MSOLUser | Select UserPrincipalName, PasswordNeverExpires

Créditos: https://dilshansaminda.wordpress.com/2014/08/05/office365-setup-user-password-to-never-expire/