Although you can manually extract attachments from Outlook emails. To do that you need to open one email at a time and download the attachment. Repeat the same process for all the emails whose attachments you want to extract. But if you have thousand of emails, then extracting attachments manually is not possible. However, using any automated tool you can complete the extraction process. I found various of tool on internet and I like the Xtraxtor tool. It is quite simple to use and do the job for you simply. You can try out your self.
Steps to Download Attachments from Outlook Emails -
1. Run the Xtraxtor tool on your system.
2. Choose your Outlook profile.
3. Click on Extract >> Attachments.
4. Browse the targeted location and hit the Save file.
Done! Here, complete the Outlook email attachment extraction process.
If there is any other suggestion, then you are most welcome.