Re: Unable to create a SendAs and Mailbox permission, command is not existing

Hi feed my mind,

You could refer to the steps below to assign Send As permission for a user:

1.Install and Configure Windows PowerShell
http://help.outlook.com/en-us/140/cc952756.aspx
2.Connect Windows PowerShell to the Service
http://help.outlook.com/en-us/140/cc952755.aspx
when you open the PowerShell, please right click the PowerShell and select run as administrator.
3.Run the command below to assign send as permission for a user:
Add-RecipientPermission <mailbox identity> -AccessRights SendAs -Trustee <user ID>

For more information about give users Send As permission, please refer to the link below :
http://help.outlook.com/en-us/140/ff852815.aspx

If you encounter any errors when you run the command, please post a screen shoot here for us to troubleshoot the issue.

Thanks,
Linda Wang