Your new OOS farm can be connected to any version of Exchange from 2007 to 2016. Connecting OOS to any version of Exchange previous to Exchange 2016 just allows users to open documents from OWA within the browser. That is not a terribly compelling feature, and I don’t recall ever deploying WAC for a customer to be used for just Exchange. The few times that I have connected WAC to Exchange, it was intended to be used for Lync or SharePoint and just connected to Exchange “because it was there”.
Read MoreOne of the new features of Exchange 2016 is the inclusion of “Modern Attachments”. Modern Attachments are not attachments at all, but links to Office documents that are stored within SharePoint sites but presented to look like attachments within email messages. Modern Attachments are a great step forward in that they allow users to continue to use attachments in the way they are used to while removing those files from your Exchange 2016 servers.
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