• An Exchange 2010 Client Access server exists in each Exchange organization.
  
  
• A federation trust with the Microsoft Federation Gateway is established for each Exchange organization. For details, see Create a Federation Trust.
  
  
• The federated organization identifier is configured for each Exchange organization. Also, any primary and secondary SMTP domains used for generating users' e-mail addresses have been added to the Microsoft Federation Gateway as accepted domains for both Exchange organizations. For details, see Configure Federated Delegation.
  
  
• User mailboxes are on Exchange 2010 Mailbox servers in each Exchange organization.
  
  

• An Exchange 2010 Client Access server exists in the Exchange organization that's sharing user's calendar information.
  
  
• User mailboxes are on Exchange 2010 Mailbox servers in the Exchange organization that's sharing user's calendar information.
  
  
• The Client Access server is enabled for Outlook Web App access, and a publishing virtual directory is enabled. For details, see Set-OwaVirtualDirectory.
  
  
• The Mailbox server's Web proxy URL is configured. For details, see Set-ExchangeServer.
  
  

• Use the EMC to configure sharing policy properties
  
  
• Use the Shell to configure sharing policy properties
  
  

You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "Sharing policies" entry in the Mailbox Permissions topic.

1. In the console tree, navigate to Organization Configuration > Mailbox.
   
   
2. In the result pane, click the Sharing Policies tab, and then click the sharing policy you want to view or configure.
   
   
3. In the action pane, under the sharing policy name, click Properties.
   
   
4. Use the General tab to view or modify the following sharing policy information.
   
   
   • Name   This unlabeled box lists the name of the sharing policy. You can modify this field.
     
     
   • Add   Click this button to open the Add Action to Sharing Policy Domain dialog box. Use this dialog box to specify the domains and actions that this sharing policy applies to. Complete the following fields:
     
     Specify a domain of an external Exchange organization, or "*" for any domain   Use this box to type the fully qualified domain name (FQDN) of an external Exchange organization, for example Contoso.com.
     
     Specify the actions that apply to the federated domain   Use this list to select one of the following sharing levels you want to enforce:
     
     Calendar sharing with free/busy information only
     
     Calendar sharing with free/busy information, plus subject and location
     
     Calendar sharing with free/busy information plus subject, location, and body
     
     Contacts sharing
     
     Calendar sharing with free/busy information only, Contacts sharing
     
     Calendar sharing with free/busy information, plus subject and location, Contacts sharing
     
     Calendar sharing with free/busy information plus subject, location, and body, Contacts sharing
     
     
   • Edit   Select a domain, and then click this button to edit the domain name or action.
     
     
   •    Select a domain, and then click this button to remove the domain from the sharing policy.
     
     
   • Enable sharing policy   Select this check box to enable the sharing of calendar and contact information with recipients in the external domains that you specified in the policy. If you clear this check box, mailboxes assigned this policy won't be able to share calendar and contact information with the external domains or users specified in the policy. Additionally, existing shared calendar and contacts folders will no longer be shared with the external domains or users specified in the policy.
     
     
5. Use the Mailboxes tab to add or remove the mailboxes in your organization that this sharing policy applies to.
   
   
   • Add   Click this button to select the mailboxes to which you want to apply this sharing policy.
     
     

     Note:
     You can also apply the sharing policy to mailboxes by using the Mailbox Settings tab in the mailbox's property page.

   •    Select mailboxes from the list, and then click this button to remove the sharing policy from the specified mailboxes.
     
     

You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "Sharing policies" entry in the Mailbox Permissions topic.

This example modifies the sharing policy Contoso for the external federated domain contoso.com. This policy allows users in the Contoso domain to see your users' basic calendar availability (free/busy) information and contacts.

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Set-SharingPolicy -Identity Contoso -Domains 'contoso.com: CalendarSharingFreeBusySimple, ContactsSharing'

This example adds a second federated domain to the sharing policy SharingPolicy01. When you add a domain to an existing policy, you must include any previously included domains.

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Set-SharingPolicy -Identity SharingPolicy01 -Domains 'contoso.com: CalendarSharingFreeBusySimple', 'atlanta.contoso.com: CalendarSharingFreeBusyReviewer', 'beijing.contoso.com: CalendarSharingFreeBusyReviewer'

This example modifies the sharing policy for the non-federated Anonymous domain. This policy allows users in the Anonymous domain to see your users' detailed calendar availability (free/busy) information. The policy is enabled.

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Set-SharingPolicy -Name "Anonymous" -Domains 'Anonymous: CalendarSharingFreeBusyDetail' -Enabled $true

For detailed syntax and parameter information, see Set-SharingPolicy.