We are on Exchange 2016, just applied latest update yesterday. Apparently as related to the update (although I can’t 100% confirm at this time), OWA users are getting an error message when trying to open attachments. The error message is: An unexpected error occurred and your request couldn't be handled.
Google search isn’t helping. Has anybody else seen this or know of a fix? I will note that we are using a different domain name for attachments, as related to some previous fix that I can’t recall—in case that makes a difference.
Bill Mayo