In this recipe, we will take a look at how to integrate the Office Online Server (OOS) with Exchange 2016. In Exchange Online in Office 365, we already have this functionality/workload with Office Online, where you receive an email with an attachment and it gives our end users the option of opening the attachment in a feature-rich browser-based application without having to download it first.
A requirement for this integration is to be on Exchange 2016, Cumulative Update 1 level or higher. If you want your users to be able to view the attachments even outside of your network, the OOS server needs to be reachable from the Internet through TCP port 443.
With this short introduction, let's go through the steps we have to perform in order to have this integration.