It's possible ? If no exist any 3d part web application that do it ? Thanks in advance.

You cannot create mailboxes from Exchange 2010 ECP Mike Crowley | MVP My Blog -- Planet Technologies

You cannot create mailboxes from Exchange 2010 ECP Mike Crowley | MVP My Blog -- Planet Technologies

Thanks, but exist any 3d part application that do it?

I have not heard of any 3rd party apps that extend ECP. If you are hosting Exchange 2010 for customers, and want to expose management functions to the customers, you might look to a control panel such as: http://www.ems-cortex.com/hosted-exchange/customer-features.aspx Otherwise- What are you trying to accomplish? Why not use EMS or EMC? Mike Crowley | MVP My Blog -- Planet Technologies

A linked mailbox is a mailbox associated with an external account. The resource forest scenario is an example of when you would want to associate a mailbox with an external account. In a resource forest scenario, user objects in the Exchange forest have mailboxes, but the user objects are disabled for logon. You must associate these disabled user accounts in the Exchange forest with enabled user objects in the external accounts forest. And you can use the EMC or Shell to create a linked mailbox.Noya Lau TechNet Community Support