- You configure a federation trust between two organizations by using Microsoft Federation Gateway.
- The first organization is a mixed Exchange Server 2003 and Exchange Server 2010 environment.
- The second organization is an Exchange Server 2010 only environment.
- A user in the second organization looks up the free/busy information of an Exchange Server 2003 mailbox user in the first organization.
Article ID: 2506820 - Last Review: Jul 28, 2011 - Revision: 1