First of all you will need to connect to your tenant with your global admin account using the following script

Import-Module MSOnline

$O365Cred = Get-Credential

$O365Session = New-PSSession –ConfigurationName Microsoft.Exchange -ConnectionUrihttps://ps.outlook.com/powershell -Credential $O365Cred -Authentication Basic -AllowRedirection

Import-PSSession $O365Session

Connect-MsolService –Credential $O365Cred

After connecting you will need to type the following command line which will export all users in a specific domain that’s added to your portal if you have more than one domain added there.

Get-MsolUser -DomainName Domain.com | Select UserPrincipalName | Export-Csv C:\users.csv –NoTypeInformation

Change passwords for those users by using the following command and pressing enter you’ll be giving a line to enter your new password that you wanna set for all users in the exported file.

$PASS = Read-Host

Run this command to change the passwords

Import-Csv C:\Users.csv | % {Set-MsolUserPassword -userPrincipalName $_.UserPrincipalName -NewPassword $PASS -ForceChangePassword $True}

That’s it. Now users inside the exported csv file have the new password which you have just set.

Note that users will be prompted to reset their passwords upon login, if you don’t want this to happen you can remove the -ForceChangePassword $True parameter.

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