OutlookAttachView is a free portable tool for Windows that scans all attachments in your Outlook profile and displays them in a simple list view. This can be best used for searching a specific attachment or for deleting a huge attachment that is taking lot of space. Apart from the Search feature, you can also Download the attachments easily, just select the attachments you want to download and click Save.
Since it is portable tool, it needs no installation and has the ability to search multiple Outlook profiles at once. According to NirSoft,
If you have only one profile in your Outlook, and this profile doesn’t require any password, you can run OutlookAttachView even without starting Outlook, and it’ll automatically scan the mailbox of your current Outlook profile. Otherwise, it’s recommended to open Outlook in the right profile before starting OutlookAttachView.
You can also export the list of attachments into xml/html/text/csv file. It works on Windows 2000/XP/Vista/Server 2003/Server2008 and any version of Outlook. Enjoy!