This article applies to:
7.x Email Manager for Outlook
When trying to view an attachment in the preview pane, you may see this message that will hang indefinitely:
“Please wait, downloading your document from SharePoint. Please click the link below to go to the file directly.”
This behavior will happen because Outlook has a built-in 20 MB restriction on attachments. This restriction will not only prevent you from viewing an attachment of that size in the preview pane, but also from moving an attachment to a favorite or folder.