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@Alan ; No, it's not the case. Security has been set to user object. The main reason is the autoload of shared mailbox into Outlook. putting people into group do not work with autoload of sharedmailbox....<br />
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@Jose Ortega : question is does the statements will do the job they are supposed to do [REMOVE RIGHT FOR USER $strUser to ALL MAILBOXES AND SUPPRESS SEND ON BEHALF RIGHT FOR $strUser to ALL MAILBOXES AND, is it the best manner to do it.
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@Alan ; No, it's not the case. Security has been set to user object. The main reason is the autoload of shared mailbox into Outlook. putting people into group do not work with autoload of sharedmailbox....

@Jose Ortega : question is does the statements will do the job they are supposed to do [REMOVE RIGHT FOR USER $strUser to ALL MAILBOXES AND SUPPRESS SEND ON BEHALF RIGHT FOR $strUser to ALL MAILBOXES AND, is it the best manner to do it.

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Is this a statement state of the art?<br />
#Remove permission to all mailboxes for user $strUser<br />
Get-MailboxDataBase | Remove-MailboxPermission -User $strUser -AccessRights FullAccess <br />
#Remove SendOnBehalf of right to all mailboxes for user $strUser<br />
Get-MailboxDatabase | Remove-ADPermission -User $strUser -ExtendedRights &quot;send as&quot;
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Is this a statement state of the art?
#Remove permission to all mailboxes for user $strUser
Get-MailboxDataBase | Remove-MailboxPermission -User $strUser -AccessRights FullAccess 
#Remove SendOnBehalf of right to all mailboxes for user $strUser
Get-MailboxDatabase | Remove-ADPermission -User $strUser -ExtendedRights "send as"

remove all rights for a specific user on all  exchange mailboxes

Windows PowerShell is a task automation and configuration management framework from Microsoft, consisting of a command-line shell and associated scripting language built on the .NET Framework. PowerShell provides full access to the Component Object Model (COM) and Windows Management Instrumentation (WMI), enabling administrators to perform administrative tasks on both local and remote Windows systems as well as WS-Management and Common Information Model (CIM) enabling management of remote Linux systems and network devices.

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Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.