Applies to: Exchange Server 2010 SP3, Exchange Server 2010 SP2

Topic Last Modified: 2012-05-11

Sharing free/busy (calendar availability) information between users located on-premises and in the Exchange Online organization is one of the primary benefits of a hybrid deployment. Users in both organizations can view each other's calendars just as if they were located in the same physical organization. This makes scheduling meetings and resources easy and efficient.

Several components in a hybrid deployment are required to enable the shared free/busy feature in an Exchange 2010 deployment:

When configuring your organization for a hybrid deployment, configuring shared free/busy calendar access is automatically configured by the Manage Hybrid Configuration wizard in all scenarios. Creating a federation trust with the Microsoft Federation Gateway and configuring organization relationships for the on-premises and Exchange Online organization are hybrid deployment requirements. If you don't want to allow free/busy sharing between your on-premises and Exchange Online organization users in the hybrid deployment, you can manually disable free/busy sharing by using the Shell and the Set-HybridConfiguration cmdlet after the Manage Hybrid Configuration wizard has completed.

The hybrid deployment features shown in the following table have a dependency on federation trusts and organization relationships.

Messaging area Feature

E-mail client

  • Message tracking

  • MailTips

  • Multi-mailbox search


  • Mailbox moves

  • Secure intra-organization message delivery


  • Exchange Online Archiving