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Set-SharingPolicy

Use the Set-SharingPolicy cmdlet to modify existing sharing policies that control how users inside your organization can share free/busy and contact information with users outside your organization. Exchange PowerShell reference

From the Exchange PowerShell reference 8 parameters Its page in the reference

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Parameters

8 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the identity of the sharing policy that you want to modify.
-Confirm, -cfThe Confirm switch specifies whether to show or hide the confirmation prompt.
-DefaultThe Default switch specifies that the sharing policy is the default sharing policy for all mailboxes.
-DomainControllerThe DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory.
-DomainsThe Domains parameter specifies the domains and the associated sharing options for those domains in the sharing policy.
-EnabledThe Enabled parameter specifies whether to enable the sharing policy.
-NameThe Name parameter specifies the unique name of the sharing policy.
-WhatIf, -wiThe WhatIf switch shows what the command does without making any changes.