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But this method takes lots of time if you have many attachments to download. To download all attachment from Outlook you can select the attachment and save it one by one.
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If all the above solutions do not work then the last option is to download all PDF attachments and open it through Adobe Reader or any other app. Alternative Way to Fix Unable to Open PDF Attachments in Outlook So check in Windows settings that the default app for PDF is properly selected.

The most common PDF document viewer is Adobe Reader. #Method 4 Check PDF Default Program – We know that PDF is a very common file format that can be open with the help of many software. Or if you don’t have any antivirus installed in your computer then check Windows default defender settings. So, check in the settings if it is blocking the file of a certain format for all email attachments. Because some third-party antivirus software might interfere with the email attachment. #Method 3 Check Antivirus or Firewall Settings- Firewall and anti-virus might also be this season for unable to open PDF attachments in Outlook. So if you not previously encountered this issue in your Outlook then go and check for updates. An update is important because Microsoft Office receives security updates in a regular time period. #Method 2: Update Microsoft Outlook – Sometimes if an update is available and your Outlook is not updated then you may encounter unable to open PDF attachments in Outlook.

# Method 1 Enable Previewer – To view the email attachments in Outlook you have to enable the attachment preview option to enable. In this section, we are going to discuss some manual tips to overcome this issue.
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So, if anyone knows the solution then please suggest me.” How to Fix Unable to Open PDF attachments in Outlook-Manually I have tried many times but still not able to open and save it. If I try to open it then there is an error message “Acrobat could not open file”. But recently, I have encountered this issue of certain PDF attachments are unable to open in Outlook. “Hi, I am using Microsoft Outlook Home and Business 2016. However, before starting the blog let have a quick look at a user query to understand the whole attachments issue.
