Attachments not opening in Outlook 2016, Outlook 2019 & Office 365 when double clicking on them

If double clicking on an attachment is not working in Microsoft Outlook 2016, Outlook 2019 or Outlook Microsoft 365, a solution could be just to change the double-click speed in Mouse Settings.

Follow these steps:

  • Click on Start and type Mouse in to the Type here to search box, then click on Mouse settings or Open

    NOTE: If the Type here to search box is not visible, just start typing after you click on Start and it will appear

  • Then click on Additional mouse options

  • Then under Double-click speed, move the pointer to the left which will slow down the Double-click option

    NOTE: Sliding the Double-click speed slider one step to the left is normally sufficient to fix this issue. However, if the issue still occurs, you may have to slide it further.

  • Click OK

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