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Federation stops working after enabling a HostingProvider with “EnabledSharedAddressSpace” turned on

This could be, for example, Lync- or Exchange Online¬†/ Office365. Recently, federation broke when implementing “voicemail in the cloud” with Microsoft’s Exchange Online. Microsoft Exchange was configured in Hybrid mode, all successful and operational – users could be moved back and forth and use either Exchange on-premise or Exchange online. Unified Messaging was already enabled…

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