You can use the Hybrid Edition of Exchange Server 2010 only to enable hybrid functionality between Exchange Online users ...

You can use the Hybrid Edition of Exchange Server 2010 only to enable hybrid functionality between Exchange Online users and on-premises Exchange 2003 or 2007 users. You cannot use the hybrid server to host on-premises mailboxes, to enable calendar sharing with other organizations (except for calendar sharing with Exchange Online users), to perform email filtering, or any other functionality that is not required for hybrid deployment.