question

This isnt an Exchange issues.
Example:

 get-aduser |  Set-ADAccountPassword -Reset -NewPassword (ConvertTo-SecureString -AsPlainText "qwerty1234" -Force) 

https://social.technet.microsoft.com/Forums/en-US/91aa6b2a-dde0-4052-861a-7c3e1eb3e3c6/powershell-script-change-password-for-multiple-users?forum=winserverpowershell

or:

https://adamtheautomator.com/set-adaccountpassword/#Resetting_Multiple_User_Passwords

Hi @Abdelloukan-0643

Agree with Andy, we generally manage users' password in AD side. How to Reset a User Password in Active Directory with PowerShell?
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.

In the command set-mailbox also has the parameter -Password, The Password parameter resets the password of the user account that's associated with the mailbox to the value you specify. To use this parameter on a mailbox other than your own, you need to be a member of one of the following role groups:

On-premises Exchange: The Organization Management or Help Desk role groups via the User Options role. The Reset Password role also allows you to use this parameter, but it isn't assigned to any role groups by default.

This parameter uses the syntax (ConvertTo-SecureString -String '<password>' -AsPlainText -Force). Or, before you run this command, store the password as a variable (for example, $password = Read-Host "Enter password" -AsSecureString), and then use the variable name ($password) for this parameter.

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