If you are trying to open a PDF and it is open on the Internet instead. Make sure that you setup Adobe Acrobat Reader DC as your default.
Step-by-step guide
In order to setup Outlook to your default:
- Click on the Windows button.
- Type Settings or click on the settings icon.
- Type Default.
- Click on Default app Settings.
- Scroll down and click on Set Default by app.
- From the Programs menu, select Adobe Acrobat Reader DC.
- Click on Set this Program as Default.
- Click OK.
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