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After you install this update, you can run the following cmdlets for Microsoft Skype for Business on Mac users to restrict external access globally or on a per-user basis in a Microsoft Skype for Business Server 2015 environment:
Globally
Set-CsPlatformServiceSettings -EnableExternalAccessCheck $false
On a per-user basis
Set-CsExternalAccessPolicy -EnableOutsideAccess $false
To enable this feature, install the December 2017 cumulative update 6.0.9319.510 for Skype for Business Server 2015, Web Components Server.
Keywords: kb, kbsurveynew, kbexpertiseadvanced, restrict external access