In a previous blog article, we walked through the steps to deploy an Office 365 Lync Hybrid solution with Shared SIP Address Space. We also created some Lync users hosted on-prem and some hosted on-line. However, since no Exchange on-prem servers were deployed, all user mailboxes can only be hosted on the Office365 E3 plan. This post is the first of a two-part series where we continue to build on the hybrid environment and walk through how to configure Exchange Online to work with Lync Hybrid and how to properly provision user mailboxes that can provide email services to Lync users. Lets recap on the architecture again as shown in the diagram: |