In Earlier versions of Exchange, If we configure the Conference Room to accept the External meeting request by enabling –processexternalmeetingmessages $true , External meeting requests will be processed and Sender would receive Meeting Accepted message.

However in Exchange 2010 , this external meeting request will not work , due to security reasons.   To resolve this, we need to do few tweaking’s on this …

  1. Create the Contact for External Sender in GAL
  2. Create Hub Transport Rule as shown below .

HubRule-2

By this, External Meeting request will be successfully accepted by the conference room.

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