Generally, this issue begins occurring after updating an Outlook version and you use Acrobat Reader as your default PDF reader. It occurs when using the Preview feature in Outlook to preview a PDF file, it fails and you get the error messaging that says, 'this file can't be previewed because of an error to the previewer. Well, the Outlook PDF preview handler error indicates that you can't preview a PDF file in the Outlook reading pane. Part 1: What is Outlook PDF preview handler error? So, spare some time to read the guide below and learn all plausible ways to get the PDF preview handler error in Outlook fixed. There are several common workarounds out there to help you fix the error. No doubt, Outlook PDF preview handler error is quite frustrating. If you're too going through this same situation, then you have come to the right place. Recently, a lot of users reported about PDF preview handler error in Outlook.
