Unable to Preview / Open PDF, Excel, Word Attachment in Outlook, Security Error

Hi,

If you have any issues when a user try to preview or open an attachment in Outlook, the only option it’s right-click save as.

Try this :
Search in the registry for the value : OutlookSecureTempFolder
Normally this should give you a path. (You might need to show hidden file and system file)

Go into that path, delete all the content.

Try Outlook.

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